Issue with type signature of DBAPI Connection

[William Hakim]

I was recently using the DBAPI Cursor, and it seems to me that the type signature of the `executemany()` function is incorrect:

https://github.com/sqlalchemy/sqlalchemy/blob/main/lib/sqlalchemy/engine/interfaces.py#L194

The given type signature for the second argument to `executemany()` is ` "Sequence[Sequence[Sequence[Any]] | Sequence[Mapping[str, Any]]]"`, however this doesn't appear right (and doesn't actually work) - it seems like it should instead be `Sequence[Sequence[Any]] | Sequence[Mapping[str, Any]]`.

Happy to open a Pull Request if this is indeed an issue.

Will

[Mike Bayer]

there does seem to be an extra Sequence on the outside that should be removed, please open an issue.

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