python3Packages.pydyf: fix failing tests

pkgs/development/python-modules/pydyf/default.nix

@@ -1,5 +1,6 @@
 { lib
 , buildPythonPackage
+, fetchpatch
 , fetchPypi
 , isPy3k
 , pytestCheckHook
@@ -19,6 +20,15 @@ buildPythonPackage rec {
     sha256 = "sha256-Hi9d5IF09QXeAlp9HnzwG73ZQiyoq5RReCvwDuF4YCw=";
   };
 
+  patches = [
+    # Fix tests for Ghostscript 9.56
+    # Remove after v0.1.3 has been released
+    (fetchpatch {
+      url = "https://github.com/CourtBouillon/pydyf/commit/d4c34823f1d15368753c9c26f7acc7a24fc2d979.patch";
+      sha256 = "sha256-2hHZW/q5CbStbpSJYbm3b23qKXANEb5jbPGQ83uHC+Q=";
+    })
+  ];
+
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace "--isort --flake8 --cov --no-cov-on-fail" ""