fix(deps): bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/firebase-hosting-merge.yml

@@ -31,7 +31,7 @@ jobs:
           echo "VITE_APP_KEYWORDS: $VITE_APP_KEYWORDS"
           echo "VITE_APP_LANG: $VITE_APP_LANG"
           echo "VITE_APP_GRAPHQL_URL: $VITE_APP_GRAPHQL_URL"
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: npm ci && npm run build
       - uses: FirebaseExtended/action-hosting-deploy@v0
         with:

.github/workflows/firebase-hosting-pull-request.yml

@@ -18,7 +18,7 @@ jobs:
       VITE_APP_GRAPHQL_URL: ${{ vars.VITE_APP_GRAPHQL_URL }}
       VITE_APP_GRAPHQL_SECRET: ${{ secrets.VITE_APP_GRAPHQL_SECRET }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: npm ci && npm run build
       - uses: FirebaseExtended/action-hosting-deploy@v0
         with: