build(deps): bump actions/checkout from 6 to 7 (#11055)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [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/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  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>

.github/workflows/benchmarks.yaml

@@ -18,7 +18,7 @@ jobs:
         with:
             python-version: "3.14"
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           ref: ${{ github.event.pull_request.base.sha }}
           fetch-depth: 0
@@ -32,7 +32,7 @@ jobs:
       - name: run benchmarks on base branch
         run: pytest --benchmark-autosave dvc/testing/benchmarks/ -k 'test_init or test_help'
 
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
           clean: false