ChangeLog: Add recent bugfix merges …

… for the Turbostat and GPU NVidia plugins.

Merge pull request collectd#3318 from mrunge/collectd-5.10

Changelog and preparation for collectd 5.10

Merge pull request collectd#3318 from mrunge/collectd-5.10

Changelog and preparation for collectd 5.10

Add changelog to prepare 5.9.2 release

Tag collectd-5.9.1

Tag for version 5.9.0

Tag for version 5.8.1.

Tag for version 5.8.0.

Tag for version 5.6.3.

Tag for version 5.7.2.