fix phpstan level 2 and below issues

Tests/ValueObject/SenderTest.php

@@ -29,7 +29,7 @@ use ReflectionException;
 
 class SenderTest extends ApiTestCase
 {
-    /** @var Sender */
+    /** @var Sender|MockObject */
     public $sender;
 
     private $phoneNumberFixture;
@@ -48,7 +48,6 @@ class SenderTest extends ApiTestCase
         $example = $phoneUtil->getExampleNumberForType($this->phoneCountryFixture, PhoneNumberType::MOBILE);
         $this->phoneNumberFixture = $phoneUtil->format($example, PhoneNumberFormat::NATIONAL);
 
-        /** @var Sender|MockObject sender */
         $this->sender = new Sender($this->phoneNumberFixture, $this->phoneCountryFixture);
     }
 

Tests/ValueObject/ValueObjectTest.php

@@ -26,11 +26,13 @@ use ReflectionException;
 
 class ValueObjectTest extends ApiTestCase
 {
+    /** @var ValueObject|MockObject */
+    public $value;
+
     public function setUp(): void
     {
         parent::setUp();
 
-        /** @var ValueObject|MockObject value */
         $this->value = $this->getMockBuilder(ValueObject::class)
             ->disableOriginalConstructor()
             ->getMock();