Missing quote, fixed

Author: benkiel

.github/workflows/run-tests.yml

@@ -18,7 +18,7 @@ jobs:
     if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
     strategy:
       matrix:
-        python-version: ['3.8', 3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
         platform: [ubuntu-latest, macos-latest, windows-latest]
         exclude: # Only test on the oldest and latest supported stable Python on macOS and Windows.
           - platform: macos-latest