Upgrade to Symfony 4.4

- disable autowiring for Event (because the Entry entity was injected)
- rename `getClient()` for test to `getTestClient()` to avoid error while overriding (from `BrowserKitAssertionsTrait`)

tests/Wallabag/CoreBundle/GuzzleSiteAuthenticator/GrabySiteConfigBuilderTest.php

@@ -303,7 +303,7 @@ class GrabySiteConfigBuilderTest extends WallabagCoreTestCase
         $builder = new GrabySiteConfigBuilder(
             $grabyConfigBuilderMock,
             $tokenStorage,
-            $this->getClient()->getContainer()->get(SiteCredentialRepository::class),
+            $this->getTestClient()->getContainer()->get(SiteCredentialRepository::class),
             $logger
         );