upgrade to latest actions

Author: hjwp

.github/workflows/tests.yml

@@ -33,6 +33,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - id: foo
-        uses: hjwp/github-actions@v5
+        uses: hjwp/github-actions@v6
         with:
           test_chapter: ${{ matrix.test_chapter }}