Let reviewdog use github-pr-annotation formatter

This is already the default for forked PRs, and most (if not all) PRs to
this repository come from forks anyways.

.github/workflows/linters.yml

@@ -2,7 +2,6 @@ name: Linters
 on: [pull_request]
 permissions:
   contents: read # to fetch code (actions/checkout)
-  checks: write # to post check annotations
 jobs:
   lint:
     name: reviewdog