Breaking change: Support ending for runners Prior to 9.0

This post announces the deprecation of GitLab runners prior to version 9.0, effective with the release of GitLab 10.0. It details the API incompatibility that will prevent older runners from communicating with the system and urges users to upgrade to version 9.0 or newer to avoid downtime. It also provides instructions on how to identify affected runners and links to the upgrade documentation.