python3Packages.pytest-dependency: Fix build with pytest ≥ 6.2.0

Commit 84d6dfc4aa22be61455c515975978ad9ae5ed195 (#113382) bumped
pytest from 6.1.2 to 6.2.2 with insufficient testing, breaking
pytest-dependency.  Fix it by pulling in the upstream patch.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

pkgs/development/python-modules/pytest-dependency/default.nix

@@ -9,6 +9,14 @@ buildPythonPackage rec {
     sha256 = "c2a892906192663f85030a6ab91304e508e546cddfe557d692d61ec57a1d946b";
   };
 
+  patches = [
+    # Fix build with pytest ≥ 6.2.0, https://github.com/RKrahl/pytest-dependency/pull/51
+    (fetchpatch {
+      url = "https://github.com/RKrahl/pytest-dependency/commit/0930889a13e2b9baa7617f05dc9b55abede5209d.patch";
+      sha256 = "0ka892j0rrlnfvk900fcph0f6lsnr9dy06q5k2s2byzwijhdw6n5";
+    })
+  ];
+
   propagatedBuildInputs = [ pytest ];
 
   checkInputs = [ pytest ];