Remove DBUnit dependencies

tests/bootstrap.php

@@ -3,17 +3,9 @@
  * This file is loaded by PHPUnit before any test.
  */
 
-use PHPUnit\DbUnit\DataSet\YamlDataSet;
-use PHPUnit\DbUnit\TestCaseTrait;
 use PHPUnit\Framework\TestCase;
 
 // Backward compatibility
 if (!class_exists(TestCase::class)) {
 	class_alias(PHPUnit_Framework_TestCase::class, TestCase::class);
 }
-if (!trait_exists(TestCaseTrait::class)) {
-	class_alias(PHPUnit_Extensions_Database_TestCase_Trait::class, TestCaseTrait::class);
-}
-if (!class_exists(YamlDataSet::class)) {
-	class_alias(PHPUnit_Extensions_Database_DataSet_YamlDataSet::class, YamlDataSet::class);
-}