fix multiprocessing ml bug

multtest.py

@@ -0,0 +1,12 @@
+import multiprocessing
+
+def worker(a):
+    print(a)
+
+if __name__ == '__main__':
+    a = []
+    multiprocessing.set_start_method('spawn')
+    p = multiprocessing.Process(target=worker, args=('hello',))
+    p.start()
+    a.append(p)
+    p.join()

robyn/processpool.py

@@ -1,7 +1,7 @@
 import asyncio
 import webbrowser
 from multiprocess import Process
-import multiprocessing as mp
+import multiprocess as mp
 import signal
 import sys
 from typing import Dict, List
@@ -78,7 +78,8 @@ def init_processpool(
     response_headers: Headers,
 ) -> List[Process]:
     process_pool = []
-    ctx = mp.get_context('spawn')
+    ctx = mp.get_context('fork')
+
 
     if sys.platform.startswith("win32"):
         spawn_process(
@@ -98,7 +99,7 @@ def init_processpool(
 
     for _ in range(processes):
         copied_socket = socket.try_clone()
-        process = Process(
+        process = ctx.Process(
             target=spawn_process,
             args=(
                 directories,