home-assistant: enable fritz component tests

These tests require pytest-mock for the mocker fixture, but it isn't
declared anywhere.

https://github.com/home-assistant/core/issues/50253

pkgs/servers/home-assistant/default.nix

@@ -176,6 +176,7 @@ in with py.pkgs; buildPythonApplication rec {
     # test infrastructure
     asynctest
     pytest-aiohttp
+    pytest-mock
     pytest-rerunfailures
     pytest-xdist
     pytestCheckHook
@@ -237,6 +238,7 @@ in with py.pkgs; buildPythonApplication rec {
     "folder"
     "folder_watcher"
     "freebox"
+    "fritz"
     "fritzbox"
     "fritzbox_callmonitor"
     "frontend"