minor symfony#58334 [Notifier][LineNotify] Add missing namespace (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Notifier][LineNotify] Add missing namespace

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
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7ce95b9 add missing namespace declaration

Author: xabbuh

src/Symfony/Component/Notifier/Bridge/LineNotify/Tests/LineNotifyTransportFactoryTest.php

@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+namespace Symfony\Component\Notifier\Bridge\LineNotify\Tests;
+
 use Symfony\Component\Notifier\Bridge\LineNotify\LineNotifyTransportFactory;
 use Symfony\Component\Notifier\Test\TransportFactoryTestCase;