imp: set default timeout for api client.

Author: Leechael

sdk/python/src/dstack_sdk/dstack_client.py

@@ -424,7 +424,7 @@ def __init__(self, endpoint: str | None = None):
     def _get_client(self) -> httpx.AsyncClient:
         if self._client is None:
             self._client = httpx.AsyncClient(
-                transport=self.transport, base_url=self.base_url
+                transport=self.transport, base_url=self.base_url, timeout=0.5
             )
         return self._client
 
@@ -471,7 +471,7 @@ def __init__(self, endpoint: str | None = None):
     def _get_client(self) -> httpx.Client:
         if self._client is None:
             self._client = httpx.Client(
-                transport=self.transport, base_url=self.base_url
+                transport=self.transport, base_url=self.base_url, timeout=0.5
             )
         return self._client