fix: wrong namespace on exceptions

Author: nunomaduro

src/Exceptions/ApiKeyIsMissing.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace OpenAI\Laravel;
+namespace OpenAI\Laravel\Exceptions;
 
 use InvalidArgumentException;
 

src/ServiceProvider.php

@@ -7,6 +7,7 @@
 use Illuminate\Support\ServiceProvider as BaseServiceProvider;
 use OpenAI;
 use OpenAI\Client;
+use OpenAI\Laravel\Exceptions\ApiKeyIsMissing;
 
 /**
  * @internal

tests/ServiceProvider.php

@@ -2,7 +2,7 @@
 
 use Illuminate\Config\Repository;
 use OpenAI\Client;
-use OpenAI\Laravel\ApiKeyIsMissing;
+use OpenAI\Laravel\Exceptions\ApiKeyIsMissing;
 use OpenAI\Laravel\ServiceProvider;
 
 it('binds the client on the container', function () {