test: remove unused @group annotations

Author: DannyvdSluijs

tests/Uri/Retrievers/FileGetContentsTest.php

@@ -7,9 +7,6 @@
 use JsonSchema\Uri\Retrievers\FileGetContents;
 use PHPUnit\Framework\TestCase;
 
-/**
- * @group FileGetContents
- */
 class FileGetContentsTest extends TestCase
 {
     public function testFetchMissingFile(): void

tests/Uri/Retrievers/PredefinedArrayTest.php

@@ -7,9 +7,6 @@
 use JsonSchema\Uri\Retrievers\PredefinedArray;
 use PHPUnit\Framework\TestCase;
 
-/**
- * @group PredefinedArray
- */
 class PredefinedArrayTest extends TestCase
 {
     private $retriever;

tests/Uri/UriRetrieverTest.php

@@ -12,9 +12,6 @@
 use JsonSchema\Validator;
 use PHPUnit\Framework\TestCase;
 
-/**
- * @group UriRetriever
- */
 class UriRetrieverTest extends TestCase
 {
     protected $validator;