fix: safely handle null/non-string errorResponse code

Author: 2shrestha22

packages/dart/lib/src/objects/response/parse_exception_response.dart

@@ -11,8 +11,9 @@ ParseResponse buildParseResponseWithException(Exception exception) {
     final errorMessage =
         errorResponse['error']?.toString() ?? exception.response?.statusMessage;
 
+    final String? codeString = errorResponse['code']?.toString();
     final errorCode =
-        int.tryParse(errorResponse['code']) ?? exception.response?.statusCode;
+        int.tryParse(codeString ?? '') ?? exception.response?.statusCode;
 
     return ParseResponse(
         error: ParseError(