Bump gitlab-omnibus-builder to v0.0.74

This pulls in Ruby v2.7 support for the Omnibus builder:
https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/merge_requests/155

.gitlab-ci.yml

@@ -50,7 +50,7 @@ variables:
   # will use images from that registry and not depend on GitLab.com
   BUILDER_IMAGE_REGISTRY: "registry.gitlab.com/gitlab-org/gitlab-omnibus-builder"
   PUBLIC_BUILDER_IMAGE_REGISTRY: "registry.gitlab.com/gitlab-org/gitlab-omnibus-builder"
-  BUILDER_IMAGE_REVISION: "0.0.73"
+  BUILDER_IMAGE_REVISION: "0.0.74"
   # The registry to pull the assets image from
   ASSET_REGISTRY: "${CI_REGISTRY}"
   ASSET_SYNC_EXISTING_REMOTE_FILES: "keep"