Update GH Actions versions

Author: Thetwam

.github/workflows/run-tests.yml

@@ -14,9 +14,9 @@ jobs:
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     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 }}
       - name: Install dependencies
@@ -40,7 +40,7 @@ jobs:
       - name: Check for missing kwargs
         run: python scripts/find_missing_kwargs.py
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}