Remove gianarb from release-managers groups
Remove gianarb from release-managers groups

Removes gianarb from release-managers and k8s-infra-release-viewers as
part of release manager associate offboarding.

Signed-off-by: hasheddan <fff88e83cd964a817f9e74a48f8df9cd0b6b9759@gmail.com>

kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io