Bump actions/checkout from 6 to 7

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>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -21,7 +21,7 @@ jobs:
           - x86
           - x64
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
@@ -49,7 +49,7 @@ jobs:
   #   name: Documentation
   #   runs-on: ubuntu-latest
   #   steps:
-  #     - uses: actions/checkout@v6
+  #     - uses: actions/checkout@v7
   #     - uses: julia-actions/setup-julia@v2
   #       with:
   #         version: '1'