Merge branch '5.2' into 5.x

* 5.2:
  [Notifier] Improve tests (5.1)
  [DoctrineBridge] Guess correct form types for DATE_IMMUTABLE and DATETIME_IMMUTABLE
  [Notifier] Fix wrong package name
  [Notifier] Fix wrong package names
  Add missing symfony/deprecation-contracts requirement
  [Notifier] [Free Mobile] Could not use custom host in DSN
  Add missing symfony/deprecation-contracts requirement

Author: derrabus

Exception/UnsupportedSchemeException.php

@@ -36,15 +36,15 @@ class UnsupportedSchemeException extends LogicException
         ],
         'googlechat' => [
             'class' => Bridge\GoogleChat\GoogleChatTransportFactory::class,
-            'package' => 'symfony/googlechat-notifier',
+            'package' => 'symfony/google-chat-notifier',
         ],
         'nexmo' => [
             'class' => Bridge\Nexmo\NexmoTransportFactory::class,
             'package' => 'symfony/nexmo-notifier',
         ],
         'rocketchat' => [
             'class' => Bridge\RocketChat\RocketChatTransportFactory::class,
-            'package' => 'rocketchat-notifier',
+            'package' => 'symfony/rocket-chat-notifier',
         ],
         'twilio' => [
             'class' => Bridge\Twilio\TwilioTransportFactory::class,
@@ -64,7 +64,7 @@ class UnsupportedSchemeException extends LogicException
         ],
         'ovhcloud' => [
             'class' => Bridge\OvhCloud\OvhCloudTransportFactory::class,
-            'package' => 'symfony/ovhcloud-notifier',
+            'package' => 'symfony/ovh-cloud-notifier',
         ],
         'sinch' => [
             'class' => Bridge\Sinch\SinchTransportFactory::class,