Update buildkite plugin plugin-linter to v3

Author: renovate-bot

.buildkite/pipeline.yml

@@ -9,7 +9,7 @@ steps:
         run: ruby
   - label: "✨ Lint"
     plugins:
-      plugin-linter#v2.0.0:
+      plugin-linter#v3.0.0:
         id: junit-annotate
   - label: ":bash: Shellcheck"
     plugins: