Update object validator to accept any type

Using `unknown` meant that the validated object would not be indexable because its type would devolve to `{}`

Author: mario-campos

src/json/index.ts

@@ -68,9 +68,9 @@ export const number = {
 
 /** A validator for object fields in schemas. */
 export const object = {
-  validate: isObject,
+  validate: isObject<any>,
   required: true,
-} as const satisfies Validator<UnvalidatedObject<unknown>>;
+} as const satisfies Validator<UnvalidatedObject<any>>;
 
 /**
  * Transforms a validator to be optional, accepting `undefined` or `null` for an