promscale: update to 0.12.1

This requires postgresql-promscale_extension greater than 0.5.0.
Please read the upstream release notes for migration instructions.

0.12.0
  Update the PromQL module with Prometheus upstream.
  Support hot reload for recording and alerting rules.
0.11.0
  General Availability of OpenTelemetry trace data support.
  Native support for PromQL-based alerting and recording rules.
  Promscale extension is mandatory starting with this release.
  Native support for the Jaeger query API in Promscale.
  Out-of-the-box alerts, Dashboards, and Runbooks

(tnn)