Update mysql
Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/3dfa7a3: Update to 8.0.19-1debian9
- https://github.com/docker-library/mysql/commit/6952c5d: Update to 5.7.29-1debian9
- https://github.com/docker-library/mysql/commit/4ee6cf3: Update to 5.6.47-1debian9

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