Deprecations when using PHPMock with phpunit 11

[SamMousa]

* MockBuilder::addMethods() is deprecated and will be removed in PHPUnit 12 without replacement.

* MockBuilder::getMockForAbstractClass() is deprecated and will be removed in PHPUnit 12 without replacement.

* MockBuilder::addMethods() is deprecated and will be removed in PHPUnit 12 without replacement.

* MockBuilder::getMockForAbstractClass() is deprecated and will be removed in PHPUnit 12 without replacement.

[michalbundyra]

@SamMousa I believe it is all solved now, and it works even with PHPUnit 12, thanks to @crocodele - see: php-mock/php-mock-phpunit#75