Log Message:
grafana: Update to 8.5.3

pkgsrc changes:
---------------
  * Add comments about usage of rc file in unprivileged.
  * Add _rc_subr_loaded variable for consistency with other rc files.

upstream changes:
-----------------
  * [8.5.3] Security: fixes CVE-2022-29170
  * https://github.com/grafana/grafana/blob/3bd6b8a5/CHANGELOG.md