chore(deps): update actions/checkout action to v3 (#520)

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

Author: renovate[bot]

.github/workflows/release-please.yml

@@ -19,7 +19,7 @@ jobs:
           token: ${{ steps.get-token.outputs.token }}
           release-type: node
           package-name: '@netlify/plugin-lighthouse'
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         if: ${{ steps.release.outputs.releases_created }}
       - uses: actions/setup-node@v2
         with: