Don't use a custom version of vitest in the new package

Author: ericallam

packages/schema-to-json/package.json

@@ -53,7 +53,6 @@
     "tshy": "^3.0.2",
     "@sinclair/typebox": "^0.34.3",
     "valibot": "^1.1.0",
-    "vitest": "^2.1.8",
     "yup": "^1.7.0",
     "zod": "^3.24.1 || ^4.0.0",
     "rimraf": "6.0.1"