fix(deps): update dependency shiki to v3

Author: renovate[bot]

bun.lockb

@@ -11,7 +11,7 @@
     "markdown-it": "^14.1.0",
     "markdown-it-anchor": "^9.0.1",
     "plainstack": "latest",
-    "shiki": "^1.7.0",
+    "shiki": "^3.0.0",
     "slugify": "^1.6.6",
     "zod": "^3.23.8"
   },