bump to v6-rc

.github/workflows/plugins.yml

@@ -54,7 +54,7 @@ jobs:
         run: make test
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v4
+        uses: peter-evans/create-pull-request@v6-rc
         with:
           branch: plugins-bump
           delete-branch: true # Delete the branch when closing pull requests, and when undeleted after merging.