Reformat cron expression line

Author: RealOrangeOne

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ name: Build, Test & Deploy
     tags:
       - "v*"
   schedule:
-    - cron: '0 0 * * 0'  # Midnight on Sunday
+    - cron: "0 0 * * 0" # Midnight on Sunday
   workflow_dispatch:
     inputs:
       pytest_addopts: