chore(internal): update jest config

Author: stainless-app[bot]

jest.config.ts

@@ -15,6 +15,7 @@ const config: JestConfigWithTsJest = {
     '<rootDir>/dist/',
     '<rootDir>/deno/',
     '<rootDir>/deno_tests/',
+    '<rootDir>/packages/',
   ],
   testPathIgnorePatterns: ['scripts'],
 };