Bump version to 0.16.2-gitlab.52

Summary

Bump docker-machine to 0.16.2-gitlab.52 for the next stable release.

The release includes the opt-in Google COS Docker network readiness gate from !183 (merged).

Release steps after merge

1. Create the signed tag:

   git tag -s v0.16.2-gitlab.52 -m "Version 0.16.2-gitlab.52"
   git push origin v0.16.2-gitlab.52

2. Confirm the tag pipeline's release stable S3 job publishes the binaries under v0.16.2-gitlab.52.
3. Canary the new binary on private blue-1 and green-1 through chef-repo.
4. Expand the pin to the Hosted Runners fleet after the binary canary passes.

Related:

• !183 (merged)
• gitlab-cookbooks/cookbook-wrapper-gitlab-runner#4
• https://gitlab.com/gitlab-com/request-for-help/-/work_items/4655

Validation

• go test ./version
• !183 (merged) merge and main pipelines passed.