[doc] Update release notes and releases ruleset

docs/pages/release_notes.md

@@ -21,6 +21,9 @@ This is useful to find duplicated sections in XML files.
 
 #### New Rules
 
+*   The new Java Rule {% rule "java/codestyle/UnnecessaryCast" %} (`java-codestyle`)
+    finds casts that are unnecessary while accessing collection elements.
+
 *   The new Java Rule {% rule "java/bestpractices/LiteralsFirstInComparisons" %} (`java-bestpractices`)
     find String literals, that are used in comparisons and are not positioned first. Using the String literal
     as the receiver of e.g. `equals` helps to avoid NullPointerExceptions.

pmd-core/src/main/resources/rulesets/releases/6250.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+
+<ruleset name="6250"
+    xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+  <description>
+This ruleset contains links to rules that are new in PMD v6.25.0
+  </description>
+
+    <rule ref="category/java/codestyle.xml/UnnecessaryCast" />
+
+</ruleset>

pmd-java/src/main/resources/rulesets/java/quickstart.xml

@@ -105,6 +105,7 @@
     <!-- <rule ref="category/java/codestyle.xml/SuspiciousConstantFieldName" /> -->
     <!-- <rule ref="category/java/codestyle.xml/TooManyStaticImports" /> -->
     <rule ref="category/java/codestyle.xml/UnnecessaryAnnotationValueElement"/>
+    <!-- <rule ref="category/java/codestyle.xml/UnnecessaryCast" /> -->
     <rule ref="category/java/codestyle.xml/UnnecessaryConstructor"/>
     <rule ref="category/java/codestyle.xml/UnnecessaryFullyQualifiedName"/>
     <rule ref="category/java/codestyle.xml/UnnecessaryLocalBeforeReturn"/>