Fix MockResponse::fromFile is too recent

Author: smnandre

src/Icons/tests/Unit/IconifyTest.php

@@ -125,10 +125,11 @@ public function testGetMetadata(): void
 
     public function testFetchSvg(): void
     {
-        $responseFile = __DIR__.'/../Fixtures/Iconify/icon.svg';
         $client = new MockHttpClient([
-            MockResponse::fromFile(__DIR__.'/../Fixtures/Iconify/collections.json', ['response_headers' => ['content-type' => 'application/json']]),
-            MockResponse::fromFile($responseFile),
+            new MockResponse(file_get_contents(__DIR__.'/../Fixtures/Iconify/collections.json'), [
+                'response_headers' => ['content-type' => 'application/json']
+            ]),
+            new MockResponse(file_get_contents(__DIR__.'/../Fixtures/Iconify/icon.svg')),
         ]);
         $iconify = new Iconify(new NullAdapter(), 'https://localhost', $client);