python3Packages.pytest-flake8: apply patch to fix compatibility with new flake8

pkgs/development/python-modules/pytest-flake8/default.nix

@@ -1,4 +1,5 @@
 { lib
+, fetchpatch
 , buildPythonPackage
 , pythonOlder
 , fetchPypi
@@ -19,6 +20,15 @@ buildPythonPackage rec {
     sha256 = "ba4f243de3cb4c2486ed9e70752c80dd4b636f7ccb27d4eba763c35ed0cd316e";
   };
 
+  patches = [
+    # https://github.com/tholo/pytest-flake8/issues/87
+    # https://github.com/tholo/pytest-flake8/pull/88
+    (fetchpatch {
+      url = "https://github.com/tholo/pytest-flake8/commit/976e6180201f7808a3007c8c5903a1637b18c0c8.patch";
+      hash = "sha256-Hbcpz4fTXtXRnIWuKuDhOVpGx9H1sdQRKqxadk2s+uE=";
+    })
+  ];
+
   propagatedBuildInputs = [
     flake8
   ];
@@ -32,6 +42,5 @@ buildPythonPackage rec {
     homepage = "https://github.com/tholo/pytest-flake8";
     maintainers = with lib.maintainers; [ jluttine ];
     license = lib.licenses.bsd2;
-    broken = true;  # https://github.com/tholo/pytest-flake8/issues/87
   };
 }