quote python version numbers

Author: electronstudio

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: macos-10.15
     strategy:
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9, 3.10 ]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10' ]
     env:
       MACOSX_DEPLOYMENT_TARGET: 10.14
     steps:
@@ -61,7 +61,7 @@ jobs:
       # You can use PyPy versions in python-version.
       # For example, pypy2 and pypy3
       matrix:
-        python-version: [ 3.6, 3.7, 3.8, 3.9, 3.10, pypy-3.6, pypy-3.7 ]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10', 'pypy-3.6', 'pypy-3.7' ]
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
@@ -109,7 +109,7 @@ jobs:
       # You can use PyPy versions in python-version.
       # For example, pypy2 and pypy3
       matrix:
-        python-version:  [ 3.6, 3.7, 3.8, 3.9, 3.10 ]
+        python-version:  [ '3.6', '3.7', '3.8', '3.9', '3.10' ]
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
@@ -169,7 +169,7 @@ jobs:
         uses: actions/[email protected]
         with:
           # Version range or exact version of a Python version to use, using SemVer's version range syntax.
-          python-version: 3.9
+          python-version: '3.9'
           # The target architecture (x86, x64) of the Python interpreter.
           architecture: x64