fix(deps): update pre-commit hook davidanson/markdownlint-cli2 to v0.19.0

mentioned in merge request ucam-faas-long!34 (merged)

mentioned in merge request gcp-function!46 (merged)

mentioned in merge request gcp-notification-to-gitlab-issue!45 (merged)

mentioned in merge request gcp-scheduled-script!58 (merged)

mentioned in merge request gcp-monitoring!14 (merged)

mentioned in merge request ucam-faas!58 (merged)

mentioned in merge request ucam-gcp-secret!16 (merged)

mentioned in merge request gcp-container-image-mirror!49 (merged)

mentioned in merge request gcp-site-monitoring!56 (merged)

mentioned in merge request gcp-pubsub-to-ms-teams!41 (merged)

mentioned in merge request gcp-cloud-run-app!135 (merged)

mentioned in merge request gcp-secret-manager!49 (merged)

mentioned in merge request gcp-cloud-run-function!59 (merged)

mentioned in merge request gcp-alert-snooze!51 (merged)

mentioned in merge request ucam-observe-remote-server!38 (merged)

mentioned in merge request gke-cluster!90 (merged)