mailman: remove importlib-resources dependency

mailman is incompatible with importlib-resources 6.x, and upstream
have decided to remove the dependency.

Fixes: 3c86835248 ("python3Packages.importlib-resources: 5.12.0 -> 6.0.1")
Link: https://gitlab.com/mailman/mailman/-/issues/1093

pkgs/servers/mail/mailman/package.nix

@@ -30,7 +30,6 @@ buildPythonPackage rec {
     flufl_i18n
     flufl_lock
     gunicorn
-    importlib-resources
     lazr_config
     passlib
     requests
@@ -52,6 +51,11 @@ buildPythonPackage rec {
       url = "https://gitlab.com/mailman/mailman/-/commit/9613154f3c04fa2383fbf017031ef263c291418d.patch";
       sha256 = "0vyw87s857vfxbf7kihwb6w094xyxmxbi1bpdqi3ybjamjycp55r";
     })
+    (fetchpatch {
+      url = "https://gitlab.com/mailman/mailman/-/commit/5e4431af6bb7d672a7ed7e3329f8fac7812d47f8.patch";
+      excludes = [ ".gitlab-ci.yml" ];
+      hash = "sha256-y2AE9hU4Z1BpBlJywxMWiuRvltWkk+R9YgMkpemvlIo=";
+    })
     ./log-stderr.patch
   ];