Update create-pull-request to v4 in themes-weekly-pull.yml

Co-authored-by: per1234 <accounts@perglass.com>

Author: francescospissu

.github/workflows/themes-weekly-pull.yml

@@ -37,7 +37,7 @@ jobs:
         run: yarn run themes:generate
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3
+        uses: peter-evans/create-pull-request@v4
         with:
           commit-message: Updated themes
           title: Update themes