Bump docker-client from 8.14.4 to 8.15.1
Bump docker-client from 8.14.4 to 8.15.1

Bumps [docker-client](https://github.com/spotify/docker-client) from 8.14.4 to 8.15.1.
- [Release notes](https://github.com/spotify/docker-client/releases)
- [Changelog](https://github.com/spotify/docker-client/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spotify/docker-client/compare/v8.14.4...v8.15.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
ketan/docker-elastic-agents,gocd-contrib/docker-elastic-agents,ketan/docker-elastic-agents,ketan/docker-elastic-agents,gocd-contrib/docker-elastic-agents,gocd-contrib/docker-elastic-agents