Update actions to use actions/checkout@v3 and actions/setup-python@v4.

Author: tompollard

.github/workflows/run-tests.yml

@@ -19,9 +19,9 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
         python-version: ["3.8", "3.9", "3.10", "3.11"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
@@ -69,7 +69,7 @@ jobs:
   build-documentation:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip