Use token to check out reference action

This commit updates the GitHub Aciton used to generate reference
documentation to use the token of the puppet-release-bot GitHub user to
check out code. This should enable the action to push to the protected
main branch, which it was unable to before.

.github/workflows/references.yaml

@@ -20,6 +20,8 @@ jobs:
     steps:
       - name: Checkout current PR
         uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.RELEASE_BOT_GITHUB_TOKEN }}
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1