net-mgmt/netdata-go: Update to v0.26.1

Bugfix release

• vernemq: fix Netsplits chart dimensions algorithm
• weblog: log first unmatched line during collect

Changelog: https://github.com/netdata/go.d.plugin/releases/tag/v0.26.1

PR: 251612
Submitted by: Dries Michiels <driesm.michiels@gmail.com> (maintainer)
Approved by: arrowd, tcberner (mentors, implizit)