home-assistant: update python-slugify override

pkgs/servers/home-assistant/default.nix

···
 let
   defaultOverrides = [
     # Override the version of some packages pinned in Home Assistant's setup.py and requirements_all.txt
-    (mkOverride "python-slugify" "4.0.1" "sha256-aaUXdm4AwSaOW7/A0BCgqFCN4LGNMK1aH/NX+K5yQnA=")
 
     # pytest-aiohttp>0.3.0 breaks home-assistant tests
     (self: super: {
···
           repo = "pyatag";
           rev = version;
           sha256 = "00ly4injmgrj34p0lyx7cz2crgnfcijmzc0540gf7hpwha0marf6";
+        };
+      });
+    })
+
+    (self: super: {
+      python-slugify = super.python-slugify.overridePythonAttrs (oldAttrs: rec {
+        pname = "python-slugify";
+        version = "4.0.1";
+        src = super.fetchPypi {
+          inherit pname version;
+          hash = "sha256-aaUXdm4AwSaOW7/A0BCgqFCN4LGNMK1aH/NX+K5yQnA=";
         };
       });
     })