fix: Add leeway to JWT token verification

Using this leeway, the `now` parameter is not needed anymore, as the
sub-1 second is calculated into the leeway.

From the documentation, the leeway is:
"Implementers MAY provide for some small leeway, usually no more than
a few minutes, to account for clock skew"

Author: kukovecz

onekey_client/client.py

@@ -1,7 +1,6 @@
 import functools
 import gc
 import secrets
-import time
 from importlib import resources
 from importlib.metadata import version
 from pathlib import Path
@@ -266,7 +265,7 @@ def _verify_token(
         claims_options=claims_options,
         claims_params={"nonce": nonce},
     )
-    decoded_token.validate(now=time.time())
+    decoded_token.validate(leeway=300)
     return decoded_token