minor #36294 Namespace fixes 44 (fabpot)

This PR was merged into the 4.4 branch.

Discussion
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Namespace fixes 44

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | n/a <!-- prefix each issue number with "Fix #", if any -->
| License       | MIT
| Doc PR        | n/a

Commits
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801f2d3 Fix wrong namespaces

src/Symfony/Component/Messenger/Tests/Transport/Receiver/SingleMessageReceiverTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Messenger\Tests\Transport\Sender;
+namespace Symfony\Component\Messenger\Tests\Transport\Receiver;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Envelope;

src/Symfony/Component/Messenger/Tests/Transport/Sync/SyncTransportFactoryTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Messenger\Tests\Transport\AmqpExt;
+namespace Symfony\Component\Messenger\Tests\Transport\Sync;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\MessageBusInterface;

src/Symfony/Component/Messenger/Tests/Transport/Sync/SyncTransportTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Messenger\Tests\Transport\AmqpExt;
+namespace Symfony\Component\Messenger\Tests\Transport\Sync;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Messenger\Envelope;