net-mgmt/netdata-go: update to 0.56.4

Changes: https://github.com/netdata/go.d.plugin/releases/tag/v0.56.4
Changes: https://github.com/netdata/go.d.plugin/releases/tag/v0.56.3
Changes: https://github.com/netdata/go.d.plugin/releases/tag/v0.56.2
Changes: https://github.com/netdata/go.d.plugin/releases/tag/v0.56.1
(cherry picked from commit c2bb1d6044d4183cf913b6234c10397bf65a2b71)