Assign a reviewer for `.gitpod.yml` as a follow up

The following discussion from !90299 (merged) should be addressed:

• @nao.hashizume started a discussion:

  As a follow up, I will create an issue to address this:

  ### Uncategorized files
  
  These files couldn't be categorized, so Danger was unable to suggest a reviewer. Please consider creating a merge request to [add support](https://gitlab.com/gitlab-org/gitlab/blob/master/tooling/danger/project_helper.rb) for them.
  
  * `.gitpod.yml`