Support OpenShift 4.12

Summary

As per note from upstream - Operator is using some deprecated APIs. That will need to be adjusted to allow deployments in OCP 4.12+ platforms.

Steps to reproduce

As mentioned in #979 (comment 1206031002) we can test for that locally using:

operator-sdk bundle validate \
  ${PWD}/operators/gitlab-operator-kubernetes/0.14.2 \
  --select-optional suite=operatorframework \
  --optional-values=k8s-version=1.22

Configuration used

(Please provide a sanitized version of the GitLab Custom Resource spec or any other relevant configuration used wrapped in a YAML code block (starting with ```yaml). Make sure to remove/change any sensitive or identifying information.)

(Paste sanitized configuration here)