bug #30697 [HttpClient] Fix missing use statement (chalasr)

This PR was merged into the 4.3-dev branch.

Discussion
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[HttpClient] Fix missing use statement

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
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6eddb52333 [HttpClient] Fix missing use statement

src/Symfony/Component/HttpClient/Response/ResponseTrait.php

@@ -13,6 +13,7 @@ namespace Symfony\Component\HttpClient\Response;
 
 use Symfony\Component\HttpClient\Chunk\DataChunk;
 use Symfony\Component\HttpClient\Chunk\ErrorChunk;
+use Symfony\Component\HttpClient\Chunk\FirstChunk;
 use Symfony\Component\HttpClient\Chunk\LastChunk;
 use Symfony\Component\HttpClient\Exception\ClientException;
 use Symfony\Component\HttpClient\Exception\JsonException;