python3Packages.av_13: disable automatic updates

It should stay at version 13.1.0 as that's the last version supported by
Home Assistant and Manim.

pkgs/development/python-modules/av_13/default.nix

@@ -15,7 +15,7 @@
 
 buildPythonPackage rec {
   pname = "av";
-  version = "13.1.0";
+  version = "13.1.0"; # nixpkgs-update: no auto update
   pyproject = true;
 
   src = fetchFromGitHub {
@@ -79,6 +79,8 @@ buildPythonPackage rec {
     "av.video"
   ];
 
+  passthru.skipBulkUpdate = true;
+
   meta = {
     changelog = "https://github.com/PyAV-Org/PyAV/blob/${src.tag}/CHANGELOG.rst";
     description = "Pythonic bindings for FFmpeg";