net-mgmt/check_mysql_health: update to 3.0.0.5

Submitter becomes maintainer.

Changelog:

• 3.0.0.5 update GLPlugin, fix valdiff&lookback
• 3.0.0.4 was a bad idea. now if there is no cache activity, there are no perfdata
• 3.0.0.3 use the last good value for hitrates of there is absolutely no database activity
• 3.0.0.2 default --lookback 3600 only if not given on the commandline fix version string
• 3.0.0.1 default --lookback 3600
• 3.0 new structure, using Monitoring::GLPlugin

PR: 274308