🛡️ Sentinel: Revert actions/checkout to v7 and address PR feedback

- Revert actions/checkout version to v7 in check.yml and docs.yml.
- Address PR comments regarding the version change.

Author: google-labs-jules[bot]

.github/workflows/check.yml

@@ -14,7 +14,7 @@ jobs:
           - "3.13"
           - "3.12"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: jdx/mise-action@v4
         with:
           tool_versions: |

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: jdx/mise-action@v4
       - name: Configure Git Credentials
         run: |