[ ] Unit, integration, and e2e (if applicable) tests updated
[x] Documentation added (or pr:no public docs PR label added if not required)
[x] Added the relevant release notes label (see labels prefixed w/ release:). These labels dictate how your PR will
show up in the autogenerated release notes.
A bit late on this, but should we update [grafana-plugin/.nvrmc](https://github.com/grafana/oncall/blob/dev/grafana-plugin/.nvmrc) (or get rid of it?)?
What this PR does
bump nodejs version to latest stable
Which issue(s) this PR closes
Checklist
pr:no public docs
PR label added if not required)release:
). These labels dictate how your PR will show up in the autogenerated release notes.