Update Godot version to match what the master branch actually tracks

conf.py

@@ -182,7 +182,7 @@ html_context = {
     # Set this to `True` when in the `latest` branch to clearly indicate to the reader
     # that they are not reading the `stable` documentation.
     "godot_is_latest": True,
-    "godot_version": "4.0",
+    "godot_version": "4.1",
     # Enables a banner that displays the up-to-date status of each article.
     "godot_show_article_status": True,
 }