Update a8c-ci-toolkit Buildkite plugin to new name and latest version

Rynaard Burger · Rynaard Burger · commit 6b23c14489ed · 2023-03-22T21:31:35.000+02:00
diff --git a/.buildkite/pipeline.yml b/.buildkite/pipeline.yml
@@ -39,7 +39,7 @@ steps:
       bundle exec rspec --profile 10 --format progress
     env: *xcode_image
     plugins:
-      automattic/bash-cache#2.0.0: ~
+      - automattic/a8c-ci-toolkit#2.15.0
     agents:
       queue: "mac"
 
