Bump actions/checkout from 6 to 7 in /.github/workflows (#78)

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -37,7 +37,7 @@ jobs:
       id-token: write
       contents: read
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Import Secrets
       id: secrets
       uses: hashicorp/vault-action@v4.0.0