bump(buildkite): e854e111 → 5bbd53d4 (#4365)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -612,7 +612,7 @@
       "source": {
         "source": "url",
         "url": "https://github.com/buildkite/skills.git",
-        "sha": "e854e111766e9494d742fe6836d5b6ecefd10b68"
+        "sha": "5bbd53d496b9dd5cd7b3e0a2d8345daa333c3f4e"
       },
       "homepage": "https://buildkite.com"
     },