fix: only expose safe fields from GitHub error response

Author: HarshMN2345

src/VCS/Adapter/Git/GitHub.php

@@ -638,7 +638,8 @@ protected function generateAccessToken(string $privateKey, ?string $appId): void
         $responseBody = $response['body'] ?? [];
         $statusCode = $response['headers']['status-code'] ?? 0;
         if (!array_key_exists('token', $responseBody)) {
-            throw new Exception('Failed to retrieve access token from GitHub API. Status: ' . $statusCode . '. Response: ' . \json_encode($responseBody));
+            $safeBody = \is_array($responseBody) ? \json_encode(\array_intersect_key($responseBody, \array_flip(['message', 'documentation_url']))) : '';
+            throw new Exception('Failed to retrieve access token from GitHub API. Status: ' . $statusCode . '. Response: ' . $safeBody);
         }
         $this->accessToken = $responseBody['token'] ?? '';
     }