fix(build): configure git checkout step

Author: bcoe

.github/workflows/release-please.yaml

@@ -77,6 +77,7 @@ jobs:
           release-type: node
           package-name: ${{env.ACTION_NAME}}
           command: github-release
+      - uses: actions/checkout@v2
       - name: tag major and patch versions
         run: |
           git config user.name github-actions[bot]