`values` arg in `unique_values_eq` has incorrect type hint.

[devmcp]

Describe the bug In unique_values_eq the docstring says that values is an iterable, but the argument has the typehint str.

There is also a typo in the docstring - should read "May be any iterable."

• [x] I have checked that this issue has not already been reported.
• [x] I have confirmed this bug exists on the latest version of pandera.
• [ ] (optional) I have confirmed this bug exists on the master branch of pandera.

[AhmetZamanis]

This issue still exists in version 0.24.0. When a list of strings is passed, the check works as expected, but it causes failures in a mypy hook (and potentially with other type checkers). Example error message:

"unique_values_eq" of "Check" has incompatible type "list[str]"; expected "str" [arg-type] ... pa.Column(dtype=str, checks=pa.Check.unique_values_eq(["mock_str1", "mock_str2"]))},