Add ignore comment for error Pylance gives even though pyright doesn't

With Pyright's strict mode disabled, I got zero issues from the CLI,
but got a Problem underline in VS Code from Pylance:
- "Gio" is unknown import symbol Pylance(reportGeneralTypeIssues)

This also silences, on the same line:
- Type of "Gio" is unknown Pylance(reportUnknownVariableType)

gi.repository uses DynamicImporter, which I assume is all the reason
the type checker "needs" to be confused, so I'm not worried about this.

src/textual_paint/wallpaper.py

@@ -92,7 +92,7 @@ def set_wallpaper(file_loc: str, first_run: bool = True):
     if desktop_env in ["gnome", "unity", "cinnamon"]:
         uri = "'file://%s'" % file_loc
         try:
-            from gi.repository import Gio
+            from gi.repository import Gio  # type: ignore
             SCHEMA = "org.gnome.desktop.background"
             KEY = "picture-uri"
             gsettings = Gio.Settings.new(SCHEMA)