Bump actions/checkout from 5 to 6 (#407)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  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/Docs.yml

@@ -21,7 +21,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: "1"

.github/workflows/Format.yml

@@ -16,7 +16,7 @@ jobs:
     if: github.event.pull_request.draft == false
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{github.event.pull_request.head.ref}}
           repository: ${{github.event.pull_request.head.repo.full_name}}

.github/workflows/Test.yml

@@ -58,7 +58,7 @@ jobs:
             memory_backend: buffer
     steps:
       - name: Checkout OpenCL.jl
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Julia
         uses: julia-actions/setup-julia@v2
@@ -71,7 +71,7 @@ jobs:
 
       - name: Checkout PoCL
         if: ${{ matrix.pocl == 'local' }}
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: pocl/pocl
           path: pocl