Update gitlab-org/container-registry from 3.14.3-gitlab to 3.15.0-gitlab

The following dependencies have been updated by deps:

• gitlab-org/container-registry from 3.14.3-gitlab to 3.15.0-gitlab

3.15.0 (2021-11-16)

Features

• gc: improve logging for artifact deletions (4d77d47)
• gc: record event type for manifest tasks queued due to an upload (1b2a534)
• handlers: temporarily log details of "find repository by path" queries (8a3fcca)
• storage: add Prometheus histogram metric for new blob uploads (8a9c4a0)

Related issues

Related to gitlab-org/container-registry#488 (closed) and gitlab-org/container-registry#487 (closed).