gtk: Add more explicit version requirements

This adds requirements for all of Gdk/GdkPixbuf before using them, as we
do for Gtk. Note that Gio/GLib/GObject are already accepted without
version by PyGObject as they are tied to the version it's compiled
against.

Fixes matplotlib#30525

Author: QuLogic

lib/matplotlib/backends/backend_gtk3.py

@@ -18,6 +18,7 @@
     # :raises ValueError: If module/version is already loaded, already
     # required, or unavailable.
     gi.require_version("Gtk", "3.0")
+    gi.require_version("Gdk", "3.0")
 except ValueError as e:
     # in this case we want to re-raise as ImportError so the
     # auto-backend selection logic correctly skips.

lib/matplotlib/backends/backend_gtk4.py

@@ -17,6 +17,8 @@
     # :raises ValueError: If module/version is already loaded, already
     # required, or unavailable.
     gi.require_version("Gtk", "4.0")
+    gi.require_version("Gdk", "4.0")
+    gi.require_version("GdkPixbuf", "2.0")
 except ValueError as e:
     # in this case we want to re-raise as ImportError so the
     # auto-backend selection logic correctly skips.