Refresh prometheus OWNERS
reviewers:
-- squat
-- paulfantom
- simonpasquier
-- dgrisonnet
- jan--f
+- fpetkovski
+- arajkumar
approvers:
-- squat
-- paulfantom
- simonpasquier
-- dgrisonnet
- jan--f
+- fpetkovski
+- arajkumar
