tee_registry: fix mypy on the ohttp config parser

`make check` (mypy) flagged `_parse_ohttp_config(raw: object)` as not
indexable. Type the decoded on-chain tuple as `Sequence[Any]`.

https://claude.ai/code/session_01L2gvK4aHX1bs3EQ61zxdkT

Author: claude

src/opengradient/client/tee_registry.py

@@ -4,7 +4,7 @@
 import random
 import ssl
 from dataclasses import dataclass
-from typing import List, NamedTuple, Optional
+from typing import Any, List, NamedTuple, Optional, Sequence
 
 from web3 import Web3
 
@@ -196,7 +196,7 @@ def get_llm_tee_ohttp_config(self) -> Optional[TEEEndpoint]:
         return random.choice(candidates)
 
 
-def _parse_ohttp_config(raw: object) -> Optional[OhttpConfig]:
+def _parse_ohttp_config(raw: Sequence[Any]) -> Optional[OhttpConfig]:
     """Coerce the decoded on-chain ohttpConfig tuple into an OhttpConfig.
 
     Returns None when the TEE has no OHTTP config registered (empty public key).