fix(client): only call .close() when needed (#664)

Author: stainless-app[bot]

src/lithic/_base_client.py

@@ -768,6 +768,9 @@ def __init__(self, **kwargs: Any) -> None:
 
 class SyncHttpxClientWrapper(DefaultHttpxClient):
     def __del__(self) -> None:
+        if self.is_closed:
+            return
+
         try:
             self.close()
         except Exception:
@@ -1349,6 +1352,9 @@ def __init__(self, **kwargs: Any) -> None:
 
 class AsyncHttpxClientWrapper(DefaultAsyncHttpxClient):
     def __del__(self) -> None:
+        if self.is_closed:
+            return
+
         try:
             # TODO(someday): support non asyncio runtimes here
             asyncio.get_running_loop().create_task(self.aclose())