Fix mypy warning(s)

[wtfsck]

See CI

mypy 1.14.0 (compiled: yes)
src/iced_x86/_iced_x86_py.pyi:12: error: Detected enum "iced_x86._iced_x86_py.CC_a" in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type`  [misc]
src/iced_x86/_iced_x86_py.pyi:12: note: See https://typing.readthedocs.io/en/latest/spec/enums.html#defining-members
src/iced_x86/_iced_x86_py.pyi:13: error: Detected enum "iced_x86._iced_x86_py.CC_ae" in a type stub with zero members. There is a chance this is due to a recent change in the semantics of enum membership. If so, use `member = value` to mark an enum member, instead of `member: type`  [misc]