chore: remove shiki as devDependency (#519)

Author: danielroe

package.json

@@ -89,7 +89,6 @@
     "pkg-pr-new": "^0.0.39",
     "playwright-core": "^1.50.1",
     "semver": "^7.7.1",
-    "shiki": "^2.5.0",
     "typescript": "^5.7.3",
     "unbuild": "^3.3.1",
     "vite": "^6.1.1",