fix: update class-validator and fix validate function with simple custom implementation

[mo4islona]

New class-validator@0.14.2 stopped working with a string array args

@Resolver()
export class ArgResolver {
    @Query(() => Boolean, { nullable: false })
    stringArray(@Arg('ids', () => [String]) ids: string[]): boolean {
        return true
    }
}

The root cause of the mess here is that if the value is a string
https://github.com/typestack/class-validator/blob/develop/src/validation/Validator.ts#L100

We simply need to skip this behaviour.