Add phpunit 9 compatibility

Author: VincentLanglet

src/Rules/PHPUnit/MockMethodCallRule.php

@@ -8,7 +8,7 @@
 use PHPStan\Type\Generic\GenericObjectType;
 use PHPStan\Type\IntersectionType;
 use PHPStan\Type\ObjectType;
-use PHPUnit\Framework\MockObject\InvocationMocker;
+use PHPUnit\Framework\MockObject\Builder\InvocationMocker;
 use PHPUnit\Framework\MockObject\MockObject;
 
 /**

src/Type/PHPUnit/MockObjectDynamicReturnTypeExtension.php

@@ -9,7 +9,7 @@
 use PHPStan\Type\IntersectionType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeWithClassName;
-use PHPUnit\Framework\MockObject\InvocationMocker;
+use PHPUnit\Framework\MockObject\Builder\InvocationMocker;
 use PHPUnit\Framework\MockObject\MockObject;
 
 class MockObjectDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension