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/ci-cd.yml

@@ -65,7 +65,7 @@ jobs:
         ${{ steps.dist-filenames-detection.outputs.wheel-filename }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Set up Python ${{ env.PYTHON_LATEST }}
       uses: actions/setup-python@v6
       with:
@@ -403,7 +403,7 @@ jobs:
     timeout-minutes: 10
     steps:
     - name: Checkout project
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Python 3.13
       id: python-install
       uses: actions/setup-python@v6

.github/workflows/codeql.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v4

.github/workflows/reusable-linters.yml

@@ -27,7 +27,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Python ${{ env.PYTHON_LATEST }}
       uses: actions/setup-python@v6
       with: