Bump actions/checkout from 4.2.2 to 6.0.2

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.2.2 to 6.0.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@11bd719...de0fac2)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/dev.yml

@@ -14,7 +14,7 @@ jobs:
         - develop
         - releases/v1.0
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
     - name: Set up Spack
       uses: ./

action.yml

@@ -41,14 +41,14 @@ runs:
   using: "composite"
   steps:
   - name: Checkout Spack
-    uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
     with:
       repository: ${{ inputs.repository }}
       path: ${{ inputs.path }}
       ref: ${{ inputs.spack_ref }}
 
   - name: Checkout Spack packages
-    uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
     with:
       repository: ${{ inputs.packages_repository }}
       path: ${{ inputs.packages_path }}