Revert "Migrate to phpspec/prophecy-phpunit"

This reverts commit e03ad06.
Supporting phpspec/prophecy-phpunit at this point, would require
dropping php <= 7.2 support. We can re-visit this matter once we start
supporting phpunit 10.

Author: athos-ribeiro

composer.json

@@ -16,7 +16,6 @@
     "require-dev": {
         "doctrine/collections": "^1.6.8",
         "doctrine/common": "^2.13.3 || ^3.2.2",
-        "phpspec/prophecy-phpunit": "^2.0",
         "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
     },
     "conflict": {

tests/DeepCopyTest/TypeFilter/Spl/ArrayObjectFilterTest.php

@@ -6,7 +6,7 @@
 use DeepCopy\DeepCopy;
 use DeepCopy\TypeFilter\Spl\ArrayObjectFilter;
 use PHPUnit\Framework\TestCase;
-use Prophecy\PhpUnit\ProphecyTrait;
+use Prophecy\Prophecy\ObjectProphecy;
 use RecursiveArrayIterator;
 
 /**
@@ -16,14 +16,13 @@
  */
 final class ArrayObjectFilterTest extends TestCase
 {
-    use ProphecyTrait;
     /**
      * @var ArrayObjectFilter
      */
     private $arrayObjectFilter;
 
     /**
-     * @var DeepCopy|ProphecyTrait
+     * @var DeepCopy|ObjectProphecy
      */
     private $copierProphecy;