databases/mysql57-*: Update to 5.7.42

Bugs Fixed

InnoDB: Prevent online DDL operations from accessing out-of-bounds
memory. (Bug #34750489, Bug #108925)

Replication: Some binary log events were not always handled
correctly. (Bug #34617506)

Replication: Setting binlog_order_commits to OFF could lead to a
missed GTID in the next binary log file's Previous_gtids event.

Our thanks to Yewei Xu and the Tencent team for the contribution.
(Bug #109485, Bug #34930969)

A client setting the character set to an impermissible client
character set (ucs2, utf16, utf16le, or utf32) could cause unexpected
behavior when the client used an authentication plugin. (Bug #35054579)

The scope of the connect_timeout limit was extended to full-packet
reads. (Bug #33723597)

References: See also: Bug #34574013.

Using --single-transaction with mysqldump version 5.7.41 required
either the RELOAD or FLUSH_TABLES privilege. This requirement now
applies only when both gtid_mode=ON (default OFF) and with
--set-gtid-purged = ON|AUTO (default AUTO). (Bug #109685, Bug #109701,
Bug #34993824, Bug #34998910, Bug #35020512)

Full Changelog: https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-42.html

Sponsored by: Netzkommune GmbH