Upgrade GitHub Actions for Node 24 compatibility

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

.github/workflows/tests.yml

@@ -44,10 +44,10 @@ jobs:
             TOXENV: py313
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'
@@ -69,7 +69,7 @@ jobs:
 
     - name: Retrieve Playwright browsers from cache if any
       id: playwright-cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: |
           ~/.cache/ms-playwright
@@ -92,7 +92,7 @@ jobs:
 
     # Cache tox environments
     - name: Cache tox environments
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: .tox
         # Include python version and os in the cache key