Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/d9fecf6: Merge pull request https://github.com/docker-library/mysql/pull/741 from infosiftr/verbose-help-args
- https://github.com/docker-library/mysql/commit/2966bfb: Add consistent variable for "--verbose --help" arguments

library/mysql

@@ -5,16 +5,16 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/mysql.git
 
 Tags: 8.0.23, 8.0, 8, latest
-GitCommit: d72fdef749b3b6c140e4b0d6a87f12737ed3554a
+GitCommit: 2966bfbd71cf370770cd880aa45f3c8f155d0aae
 Directory: 8.0
 File: Dockerfile.debian
 
 Tags: 5.7.33, 5.7, 5
-GitCommit: 3fde29717aea785d4e37a97c9990ff0fda37e544
+GitCommit: 2966bfbd71cf370770cd880aa45f3c8f155d0aae
 Directory: 5.7
 File: Dockerfile.debian
 
 Tags: 5.6.51, 5.6
-GitCommit: c273193c14bb45daea2d27bb6ec51aa0b2b2ab9b
+GitCommit: 2966bfbd71cf370770cd880aa45f3c8f155d0aae
 Directory: 5.6
 File: Dockerfile.debian