Replace old java-faker with kotlin-faker

[serpro69]

Was going through some of your code and saw that you're using an unmaintained and buggy java-faker, so decided to replace it with kotlin-faker. Hope this is a good change for you :) And thanks for your awesome tutorials :)

There's also a reference to java-faker in https://github.com/eugenp/tutorials/tree/master/testing-modules/mocks , which also has an article linked https://www.baeldung.com/java-faker. So I haven't replaced that since it's an article about java-faker itself. But maybe you'll be interested in updating that as well to reference kotlin-faker instead? Since java-faker has not been maintained for awhile now and also contains bugs and CVEs.