Updated dynamic return type extensions interface

Author: ondrejmirtes

src/Type/PHPUnit/CreateMockDynamicReturnTypeExtension.php

@@ -20,7 +20,7 @@ class CreateMockDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMetho
 		'getMockFromWsdl' => 1,
 	];
 
-	public static function getClass(): string
+	public function getClass(): string
 	{
 		return \PHPUnit\Framework\TestCase::class;
 	}

src/Type/PHPUnit/GetMockBuilderDynamicReturnTypeExtension.php

@@ -10,7 +10,7 @@
 class GetMockBuilderDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension
 {
 
-	public static function getClass(): string
+	public function getClass(): string
 	{
 		return \PHPUnit\Framework\TestCase::class;
 	}

src/Type/PHPUnit/MockBuilderDynamicReturnTypeExtension.php

@@ -12,7 +12,7 @@
 class MockBuilderDynamicReturnTypeExtension implements \PHPStan\Type\DynamicMethodReturnTypeExtension
 {
 
-	public static function getClass(): string
+	public function getClass(): string
 	{
 		return \PHPUnit_Framework_MockObject_MockBuilder::class;
 	}