chore(deps): bump actions/checkout from 3 to 4 (EbookFoundation#9513)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: .github/workflows/check-urls.yml

@@ -37,7 +37,7 @@ jobs:
             echo "fetch_depth=0" >> $GITHUB_OUTPUT
           fi
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: ${{ steps.set-params.outputs.fetch-depth }}
       - name: Get changed files
@@ -74,7 +74,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: ${{ needs.get-changed-files.outputs.fetch-depth }}
       - name: Setup Ruby v2.6
@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout  # for having the sources of the local action
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         # download and unzip the ab-results-*.json generated by job-matrix: check-urls
       - uses: actions/download-artifact@v3
         with:

Diff for: .github/workflows/fpb-lint.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Use Node.js
       uses: actions/setup-node@v3
       with: