CI: Stricter docs pages rule

Our tags always contains full version number, there is no reason to
allow anything else.

Author: Lorak-mmk

.github/workflows/docs-pages.yaml

@@ -7,7 +7,7 @@ on:
     branches:
       - main
     tags:
-      - 'v0.*'
+      - 'v0.*.*'
     paths:
       - "docs/**"
   workflow_dispatch: