Bump actions/checkout from 5.0.0 to 6.0.1 (#1550)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6.0.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.1
  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]

.github/workflows/gemini-review.yml

@@ -41,7 +41,7 @@ jobs:
           permission-pull-requests: "write"
 
       - name: "Checkout repository"
-        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # ratchet:actions/checkout@v5
+        uses: "actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8" # ratchet:actions/checkout@v5
 
       - name: "Run Gemini pull request review"
         uses: "google-github-actions/run-gemini-cli@v0" # ratchet:exclude