Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/75f81c8: Merge pull request https://github.com/docker-library/mysql/pull/601 from ltangvald/fixtty
- https://github.com/docker-library/mysql/commit/6659750: Apply update.sh
- https://github.com/docker-library/mysql/commit/4efd127: Revert to not using daemonize flag for temporary startup of 5.7 server

library/mysql

@@ -5,13 +5,13 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/mysql.git
 
 Tags: 8.0.18, 8.0, 8, latest
-GitCommit: 367788b4c0eccf8bf6d10e8897262d22cf816284
+GitCommit: 6659750146b7a6b91a96c786729b4d482cf49fe6
 Directory: 8.0
 
 Tags: 5.7.28, 5.7, 5
-GitCommit: 5fa3526d23a846c6a2982901bc8190025af44336
+GitCommit: 6659750146b7a6b91a96c786729b4d482cf49fe6
 Directory: 5.7
 
 Tags: 5.6.46, 5.6
-GitCommit: 49bedb5f999c19d3b931ea8bfd926a5b0a1c1db4
+GitCommit: 6659750146b7a6b91a96c786729b4d482cf49fe6
 Directory: 5.6