fix matrix

Author: blink1073

.github/workflows/test.yml

@@ -15,11 +15,11 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: [3.7, 3.8, 3.9, 3.10, pypy-3.7]
+        python-version: [3.7, 3.8, 3.9, "3.10", pypy-3.7]
         exclude:
           # pywin32 not available
           - os: windows-latest
-            python-version: 3.10
+            python-version: "3.10"
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}