Enable Minitest/AssertRaisesWithRegexpArgument cop

This PR enables `Minitest/AssertRaisesWithRegexpArgument` cop
and it suppresses the new warning below.

```console
% bundle exec rubocop
(snip)

Offenses:

activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb:111:9: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises(ActiveRecord::StatementInvalid, /TypeError/) do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb:628:9: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises(ActiveRecord::StatementInvalid, /SQLite3::ReadOnlyException/) do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
railties/test/application/rake/multi_dbs_test.rb:307:13: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises RuntimeError, /You're using a multiple database application/ do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
railties/test/application/rake/multi_dbs_test.rb:311:13: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises RuntimeError, /You're using a multiple database application/ do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
railties/test/application/rake/multi_dbs_test.rb:336:13: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises RuntimeError, /You're using a multiple database application/ do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
railties/test/application/rake/multi_dbs_test.rb:361:13: C: Minitest/AssertRaisesWithRegexpArgument:
Do not pass regular expression literals to assert_raises. Test the resulting exception.
assert_raises RuntimeError, /You're using a multiple database application/ do
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

The last argument of `assert_raises` is a custom message string to help explain failures.
So, it's not the argument that `exception.message` is compared to.
`assert_raises` returns a raised exception and can be used to match against a regular expression.

And it updates the dependency version of rubocop-minitest in the Gemfile.
Because `Minitest/AssertRaisesWithRegexpArgument` cop was introduced in minitest 0.22.
https://github.com/rubocop/rubocop-minitest/releases/tag/v0.22.0

Gemfile.lock

@@ -435,7 +435,7 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.16.0)
       parser (>= 3.1.1.0)
-    rubocop-minitest (0.17.0)
+    rubocop-minitest (0.22.0)
       rubocop (>= 0.90, < 2.0)
     rubocop-packaging (0.5.1)
       rubocop (>= 0.89, < 2.0)

activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb

@@ -108,11 +108,12 @@ def test_connection_no_db
       end
 
       def test_bad_timeout
-        assert_raises(ActiveRecord::StatementInvalid, /TypeError/) do
+        exception = assert_raises(ActiveRecord::StatementInvalid) do
           Base.sqlite3_connection(database: ":memory:",
                                   adapter: "sqlite3",
                                   timeout: "usa").connect!
         end
+        assert_match("TypeError", exception.message)
       end
 
       # connection is OK with a nil timeout
@@ -625,9 +626,10 @@ def test_writes_are_not_permitted_to_readonly_databases
                                        readonly: true
         conn.connect!
 
-        assert_raises(ActiveRecord::StatementInvalid, /SQLite3::ReadOnlyException/) do
+        exception = assert_raises(ActiveRecord::StatementInvalid) do
           conn.execute("CREATE TABLE test(id integer)")
         end
+        assert_match("SQLite3::ReadOnlyException", exception.message)
       end
 
       def test_strict_strings_by_default

railties/test/application/rake/multi_dbs_test.rb

@@ -304,13 +304,15 @@ def db_up_and_down(version, namespace = nil)
             down_output = rails("db:migrate:down:#{namespace}", "VERSION=#{version}")
             up_output = rails("db:migrate:up:#{namespace}", "VERSION=#{version}")
           else
-            assert_raises RuntimeError, /You're using a multiple database application/ do
+            exception = assert_raises RuntimeError do
               down_output = rails("db:migrate:down", "VERSION=#{version}")
             end
+            assert_match("You're using a multiple database application", exception.message)
 
-            assert_raises RuntimeError, /You're using a multiple database application/ do
+            exception = assert_raises RuntimeError do
               up_output = rails("db:migrate:up", "VERSION=#{version}")
             end
+            assert_match("You're using a multiple database application", exception.message)
           end
 
           case namespace
@@ -333,9 +335,10 @@ def db_migrate_and_rollback(namespace = nil)
           if namespace
             rollback_output = rails("db:rollback:#{namespace}")
           else
-            assert_raises RuntimeError, /You're using a multiple database application/ do
+            exception = assert_raises RuntimeError do
               rollback_output = rails("db:rollback")
             end
+            assert_match("You're using a multiple database application", exception.message)
           end
 
           case namespace
@@ -358,9 +361,10 @@ def db_migrate_redo(namespace = nil)
           if namespace
             redo_output = rails("db:migrate:redo:#{namespace}")
           else
-            assert_raises RuntimeError, /You're using a multiple database application/ do
+            exception = assert_raises RuntimeError do
               redo_output = rails("db:migrate:redo")
             end
+            assert_match("You're using a multiple database application", exception.message)
           end
 
           case namespace