Type stubs: Remove outdated Oid.hex

Author: jorio

pygit2/_pygit2.pyi

@@ -262,7 +262,6 @@ class OdbBackendPack(OdbBackend):
     def __init__(self, *args, **kwargs) -> None: ...
 
 class Oid:
-    hex: str
     raw: bytes
     def __init__(self, raw: bytes = ..., hex: str = ...) -> None: ...
     def __eq__(self, other) -> bool: ...