utf8/UTF-8 characterEncoding Connection URL property

[A248]

The documentation of MySQL Connector-J suggests AdvancedBan's default characterEncoding=utf8 is incorrect. It probably should be UTF-8, the "Java-style" name mentioned here: https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-charsets.html . It is the same for 5.1

Use Java-style names when specifying character encodings

That implies utf8 is not the right value. Indeed, this seems to be confirmed by StackOverflow: https://stackoverflow.com/a/20423184