Update file(s) from wp-cli/.github

Author: schlessera

.github/workflows/regenerate-readme.yml

@@ -76,7 +76,7 @@ jobs:
       - name: Regenerate README.md file
         run: |
           wp package install "wp-cli/scaffold-package-command:^2"
-          wp scaffold package-readme --force .
+          wp scaffold package-readme --branch=${{ github.event.repository.default_branch }} --force .
 
       - name: Check if there are changes
         id: changes