chore(deps): Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⬇️ Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: ⎔ Setup Node v${{ matrix.node }}
         uses: actions/setup-node@v4

.github/workflows/release-please.yml

@@ -17,7 +17,7 @@ jobs:
           config-file: .github/release-please/config.json
           manifest-file: .github/release-please/manifest.json
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: ${{ steps.release.outputs.release_created }}
       - uses: actions/setup-node@v4
         with: