[Swoole PSR7] Fix ServerRequest header Nyholm PSR7 (#123)

When using swoole app with PSR7, heades are not correctly set from
Swoole\Http\Request to \Nyholm\Psr7\ServerRequest

Co-authored-by: Jozef Pistej <[email protected]>

Author: pistej

src/swoole-nyholm/src/RequestHandlerRunner.php

@@ -39,7 +39,7 @@ public function handle(Request $request, Response $response): void
         $psrRequest = (new \Nyholm\Psr7\ServerRequest(
             $request->getMethod(),
             $request->server['request_uri'] ?? '/',
-            array_change_key_case($request->server ?? [], CASE_UPPER),
+            $request->header ?? [],
             $request->rawContent(),
             '1.1',
             $request->server ?? []