quote versions

Author: PaulWestenthanner

.github/workflows/test-docs-build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.10']
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2

.github/workflows/test-suite.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, 3.10]
+        python-version: ['3.5', '3.6', '3.7', '3.8', '3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v2