Bump actions/checkout from 2 to 4 (#74356)

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](https://github.com/actions/checkout/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/publish-technical-documentation-release.yml

@@ -15,12 +15,12 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout Grafana repo"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
         with:
           fetch-depth: 0
 
       - name: "Checkout Actions library"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
         with:
           repository: "grafana/grafana-github-actions"
           path: "./actions"