chore(deps): update shiki monorepo to v4.2.0

Author: renovate[bot]

package.json

@@ -39,7 +39,7 @@
   "devDependencies": {
     "@algolia/client-search": "5.52.1",
     "@eslint/js": "10.0.1",
-    "@shikijs/vitepress-twoslash": "4.0.2",
+    "@shikijs/vitepress-twoslash": "4.2.0",
     "@types/express": "5.0.6",
     "@voidzero-dev/vitepress-theme": "4.0.4",
     "@types/node": "25.6.2",