Remove explicit targeting of the hosted queue

This queue is now the default

Author: yob

.buildkite/pipeline.yml

@@ -1,27 +1,19 @@
 steps:
   - label: ":bash: Plugin"
-    agents:
-      queue: "hosted"
     plugins:
       - plugin-tester#v1.1.1: ~
 
   - label: ":ruby: Ruby"
-    agents:
-      queue: "hosted"
     plugins:
       - docker-compose#v5.3.0:
           run: ruby
 
   - label: "✨ Lint"
-    agents:
-      queue: "hosted"
     plugins:
       - plugin-linter#v3.3.0:
           id: junit-annotate
 
   - label: ":bash: Shellcheck"
-    agents:
-      queue: "hosted"
     plugins:
       - shellcheck#v1.3.0:
           files: hooks/*