Update regexes for P1 => P::1 and S1 => S::1 labels
This patch should be applied once the label change in https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/626 has landed.
refs https://gitlab.com/gitlab-com/gl-infra/triage-ops/-/issues/4 https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/626 gitlab-org/quality/triage-ops#330 (closed)