build(deps): update github.com/jackc/pgerrcode digest to 6e2875d

mentioned in commit 391938db

mentioned in issue #1231 (closed)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!3479 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!3480 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!3481 (merged)

mentioned in merge request omnibus-gitlab!7508 (merged)