Wrap ruby versions in quotes in test.yml

Author: CDThomas

.github/workflows/test.yml

@@ -9,7 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: [2.7, 3.0, 3.1]
+        # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
+        ruby-version: ['2.7', '3.0', '3.1']
     env:
       RSPEC_FULL_BACKTRACE: yes
     steps: