Remove trailing ,

Author: gziolo

tests/phpunit/tests/abilities-api/wpRegisterAbility.php

@@ -220,7 +220,7 @@ public function test_execute_ability_no_output_schema_match(): void {
 		);
 		$this->assertWPError(
 			$actual,
-			'Execution should fail due to output not matching schema.',
+			'Execution should fail due to output not matching schema.'
 		);
 		$this->assertSame( 'ability_invalid_output', $actual->get_error_code() );
 		$this->assertSame(