Exclude .proverc from manifests

3 jobs for proverc in 9 minutes and 35 seconds (queued for 2 minutes and 33 seconds)
latest
Status Job ID Name Coverage
  Build
passed #12702
build_bionic

00:03:04

passed #12701
build_buster

00:03:20

passed #12700
build_stretch

00:03:09