Upgrade GitHub Actions (#477)

Author: cclauss

.github/workflows/tests.yml

@@ -14,14 +14,14 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10.0-rc.1]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu-latest, macos-latest]
 
     env:
       PIP_DISABLE_PIP_VERSION_CHECK: 1
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 50
         submodules: true
@@ -37,7 +37,7 @@ jobs:
           __version__\s*=\s*(?:['"])([[:PEP440:]])(?:['"])
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       if: steps.release.outputs.version == 0
       with:
         python-version: ${{ matrix.python-version }}