Dev: drop unused maplibre-gl-style-spec dependency

- Unblocks pre-push knip on feature branches
Ping FixMyBerlin#289

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: 2 people

app/bun.lock

@@ -168,7 +168,6 @@
     "@aws-sdk/client-s3": "3.1075.0",
     "@clack/prompts": "1.6.0",
     "@heroicons/react": "2.2.0",
-    "@maplibre/maplibre-gl-style-spec": "^24.8.1",
     "@placemarkio/check-geojson": "0.1.14",
     "@playwright/test": "1.61.1",
     "@react-email/ui": "^6.6.4",