remove container for mysql workflow

Author: alistairewj

.github/workflows/mysql.yml

@@ -8,7 +8,6 @@ jobs:
     # only run if PR is approved
     if: github.event.review.state == 'approved'
     runs-on: ubuntu-22.04
-    container: python:3.10
 
     steps:
       - name: Check out repository code