Merge pull request #16 from collective/dependabot/github_actions/actions/checkout-6

Bump actions/checkout from 5 to 6

Author: mauritsvanrees

.github/workflows/test-matrix.yml

@@ -27,7 +27,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     name: ${{ matrix.config[1] }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
     - name: Set up Python