PHP: Override a service-provider that calls a method that's not in my Laravel?

I have an old website which was developed in Laravel 5.2 and which for various reasons can't be upgraded from that.

I have a vendor package which, in the boot() method of one ServiceProvider, has this line:

 $this->loadMigrationsFrom($somewhere);

... but this method did not exist in Laravel 5.2.

What would be the cleanest way to override this errant method-call?

It occurs to me that I might just be able to write a new service-provider class to replace this one, since all it really seems to do is to register one console command. But is there a way to "override" it?

via Chebli Mohamed