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/Docs.yml

@@ -21,7 +21,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: julia-actions/setup-julia@v3
         with:
           version: "1"

.github/workflows/Test.yml

@@ -40,7 +40,7 @@ jobs:
             pocl: local
     steps:
       - name: Checkout OpenCL.jl
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup Julia
         uses: julia-actions/setup-julia@v3
@@ -53,7 +53,7 @@ jobs:
 
       - name: Checkout PoCL
         if: ${{ matrix.pocl == 'local' }}
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           repository: pocl/pocl
           path: pocl