Update centos6 deprecation warning
In gitlab-org/gitlab-runner#3905 (closed) we got a lot of feedback from the community to keep supporting Centos 6 but just drop support for the docker executor. Reflect this change on the release blog post.
In gitlab-org/gitlab-runner#3905 (closed) we got a lot of feedback from the community to keep supporting Centos 6 but just drop support for the docker executor. Reflect this change on the release blog post.