chore(deps): update mysql docker tag to v5.7.42

Author: renovate[bot]

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
 
     services:
       mysql:
-        image: mysql:5.7.10
+        image: mysql:5.7.42
         ports:
           # Another version of MySQL is installed on the vm and already uses the port 3306.
           - 3308:3306