net-mgmt/netdata-go: Update to v0.25.0

From ChangeLog: https://github.com/netdata/go.d.plugin/releases/tag/v0.25.0

Improvements:

• weblog: custom time fields

Bugfixes:

• agent: ignore charts with type.id >= 200 (RRD_ID_LENGTH_MAX)
• mysql: fix collect slave status for MariaDB v10.2.0
• unbound: fix cumulative_stats configration option
• unbound: respect include-toplevel directive

PR: 250350
Submitted by: driesm.michiels@gmail.com (maintainer)
MFH: 2020Q4 (blanket, bugfix release)