python313Packages.foobot-async: fix build

pkgs/development/python-modules/foobot-async/default.nix

···
     hash = "sha256-QQjysk2m8QkOpLBdC8kfuoA9PcljgEwzKyrIAhxHB4c=";
   };
 
+  postPatch = ''
+    # https://github.com/reefab/foobot_async/issues/7
+    substituteInPlace foobot_async/__init__.py \
+      --replace-fail "with async_timeout.timeout" "async with async_timeout.timeout"
+  '';
+
   build-system = [ setuptools ];
 
   dependencies = [