Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>

Author: dependabot[bot]

.github/workflows/cmake.yml

@@ -20,7 +20,7 @@ jobs:
       run: cmake -E make_directory mdspan-build
 
     - name: Check Out
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         repository: kokkos/mdspan
         path: mdspan-src
@@ -58,7 +58,7 @@ jobs:
       run: cmake -E make_directory stdblas-build
 
     - name: Check Out
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         path: stdblas-src
 

.github/workflows/macos.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Check Out mdspan
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         repository: kokkos/mdspan
         path: mdspan-src
@@ -33,7 +33,7 @@ jobs:
       run: cmake --install $GITHUB_WORKSPACE/mdspan-build
 
     - name: Check Out
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         path: stdblas-src