test env: revert downgrade of pygobject to v3.30.5 (see below)

```
systemctl_mqtt/__init__.py:35: in <module>
    import gi.repository.GLib  # pylint-import-requirements: imports=PyGObject
../../../.local/share/virtualenvs/systemctl-mqtt-UQbfQXT6/lib/python3.10/site-packages/gi/__init__.py:42: in <module>
    from . import _gi
E   ImportError: [...]/python3.10/site-packages/gi/_gi.cpython-310-x86_64-linux-gnu.so: undefined symbol: _PyUnicode_AsStringAndSize
```

Pipfile.lock

@@ -47,9 +47,9 @@
         },
         "pygobject": {
             "hashes": [
-                "sha256:ab030c81278d1ed740b5093d017608316b15fc275f901854b22bcfaf8d40c528"
+                "sha256:b9803991ec0b0b4175e81fee0ad46090fa7af438fe169348a9b18ae53447afcd"
             ],
-            "version": "==3.30.5"
+            "version": "==3.42.0"
         },
         "sanitized-package": {
             "editable": true,