Replace ☢️ with :danger: in Buildkite pipeline

---

Generated with the help of Claude Code, https://code.claude.com

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mokagio

.buildkite/pipeline.yml

@@ -61,7 +61,7 @@ steps:
 
   - group: "Linters"
     steps:
-      - label: ☢️ Danger - PR Check
+      - label: ":danger: Danger - PR Check"
         command: danger
         key: danger
         if: build.pull_request.id != null