Bump actions/checkout from 5 to 6 (#100)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
           python-version: '3.13.5'
 
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Build project
         shell: pwsh

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: '3.13.5'
 
     - name: Check out code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Test
       shell: pwsh