Update the peter-evans/create-pull-request action to v7

This is needed for the draft: always-true setting.

Author: stefanhaller

.github/workflows/sponsors.yml

@@ -19,7 +19,7 @@ jobs:
           file: "README.md"
 
       - name: Create Pull Request 🚀
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           commit-message: "README.md: Update Sponsors"
           title: "README.md: Update Sponsors"