change \GuzzleHttp\Promise\all to \GuzzleHttp\Promise\Utils::all (#361)

* change \GuzzleHttp\Promise\all to \GuzzleHttp\Promise\Utils::all

* support old promises as well

* run unit tests only on pull_request

Author: k0ka

.github/workflows/unit_tests.yml

@@ -1,6 +1,5 @@
 name: Run Unit Tests
 on:
-  push:
   pull_request:
 jobs:
   tests:

src/ObjectStore/v1/Models/Container.php

@@ -233,7 +233,9 @@ public function createLargeObject(array $data): StorageObject
         }
 
         /** @var Promise $p */
-        $p = \GuzzleHttp\Promise\all($promises);
+        $p = function_exists('\GuzzleHttp\Promise\all')
+            ? \GuzzleHttp\Promise\all($promises)
+            : \GuzzleHttp\Promise\Utils::all($promises);
         $p->wait();
 
         return $this->createObject([