Update mysql
Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/6b30925: Merge pull request https://github.com/docker-library/mysql/pull/888 from infosiftr/mysql.conf.d
- https://github.com/docker-library/mysql/commit/19f5517: Add /etc/mysql/mysql.conf.d in 5.7 Oracle-based images

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