typings: fix syntax error in tsconfig

Trailing commas are invalid in JSON files.

PR-URL: nodejs#47584
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

Author: VoltrexKeyva

tsconfig.json

@@ -93,7 +93,7 @@
       "vm": ["./lib/vm.js"],
       "wasi": ["./lib/wasi.js"],
       "worker_threads": ["./lib/worker_threads.js"],
-      "zlib": ["./lib/zlib.js"],
+      "zlib": ["./lib/zlib.js"]
     }
   }
 }