Setup : New DB user should use caching_sha2_password instead of mysql_native_password

[oyeaussie]

As per Mysql documentation, mysql_native_password plugin has been disabled by default and will be completely removed from version 9.

https://dev.mysql.com/doc/refman/8.4/en/native-pluggable-authentication.html

Change the user created during setup to use caching_sha2_password instead.