chore(deps): update dependency @shikijs/transformers to ^3.15.0 (#6543)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pnpm-lock.yaml

@@ -19,7 +19,7 @@
     "@rspress/plugin-rss": "2.0.0-beta.35",
     "@rspress/plugin-sitemap": "2.0.0-beta.35",
     "@rstack-dev/doc-ui": "^1.11.0",
-    "@shikijs/transformers": "^3.14.0",
+    "@shikijs/transformers": "^3.15.0",
     "@types/node": "^24.9.2",
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",