Add support of Gnome 47 (#31)

Author: moskalenko2k24

extension/g3kb-switch@g3kb-switch.org/metadata.json

@@ -4,7 +4,8 @@
     "uuid": "g3kb-switch@g3kb-switch.org",
     "shell-version": [
         "45",
-        "46"
+        "46",
+        "47"
     ],
     "url": "https://github.com/lyokha/g3kb-switch",
     "session-modes" : [