fix: reduce default request_concurrency_limit from 500 to 10 in Downie.__init__ to match write_concurrency_limit and prevent excessive concurrent requests

src/downie/__init__.py

@@ -14,7 +14,7 @@ class Downie(BaseApplication):
 
     def __init__(self, request_concurrency_limit=500,write_concurrency_limit=10,*args, **kwargs):
         self.base_url = None
-        self.request_concurrency_limit = 500
+        self.request_concurrency_limit = 10
         self.write_concurrency_limit = 10
         self.semaphore_write = asyncio.Semaphore(self.write_concurrency_limit)
         self.semaphore_request = asyncio.Semaphore(self.request_concurrency_limit)