chore(deps): update actions/checkout action to v3 (#32)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/apollo-studio-publish.yml

@@ -11,7 +11,7 @@ jobs:
       APOLLO_KEY: ${{ secrets.APOLLO_KEY }}
       APOLLO_VCS_COMMIT: ${{ github.event.pull_request.head.sha }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Install Rover
         run: |