Upgrade MySQL JDBC .jar; raise minimum MySQL requirement to 8. #4162
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Our MySQL JDBC jar was very old; since no version of MySQL 5 is still being supported by the community, it is time to raise our minimum version to 8 and update the connector. This also seems to resolve some strange problems observed during testing of #4108.
Note that the connector class name has changed slightly, and this PR addresses that in addition to updating the jar file.
TODO: