CI: Update runner image and actions

Author: eht16

.github/workflows/tests.yml

@@ -15,17 +15,17 @@ on:
 jobs:
   test:
     name: Python ${{ matrix.python }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python: ['3.8', '3.9', '3.10', '3.11']
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}