Update mysql
Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/f4032a1: Merge pull request https://github.com/docker-library/mysql/pull/808 from ltangvald/master
- https://github.com/docker-library/mysql/commit/aa60002: Remove EOL 5.6
- https://github.com/docker-library/mysql/commit/25b68c6: Update server versions
- https://github.com/docker-library/mysql/commit/e0359cc: Apply template changes
- https://github.com/docker-library/mysql/commit/2fc7349: Update to new MySQL GPG Key
- https://github.com/docker-library/mysql/commit/37cf404: Merge pull request https://github.com/docker-library/mysql/pull/798 from ducksecops/master
- https://github.com/docker-library/mysql/commit/4207add: update GOSU to 1.14

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