Actions(deps): Bump actions/checkout from 5 to 6

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/codespell.yml

@@ -33,7 +33,7 @@ jobs:
     name: Enforce codespell-clean spelling
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: codespell-project/actions-codespell@v2
         with:

.github/workflows/run_test_suite.yml

@@ -51,7 +51,7 @@ jobs:
             gcc: 15
             install: binutils g++-15 gcc-15 cpp-15
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Add repository "ubuntu-toolchain-r" for GCC 15
         if: "${{ matrix.gcc == '15' }}"