redundant-none-literal (PYI061): Unsafe or different autofix for Python 3.9

[Avasam]

Description

In #14872, more autofixes were added for redundant-none-literal (PYI061), but it only applies to Python 3.10+ as the | may not be usable in annotations in <=3.9 in all cases, even with from __future__ import annotations.

I am requesting to either allow the fix on <=3.9 as an "unsafe" autofix.
OR to autofix using typing.Union. Leaving the Union --> | transformation logic to other (UP?) rules.

I also think this fix should always be available using | in type stubs (.pyi files)

Current vs expected

The following code:

def get_rotation(rotation: float | Literal[None, "horizontal", "vertical"]) -> float: ...

With the following command:
ruff check --fix --unsafe-fixes --preview --select=PYI061 --isolated --target-version=py39

In Ruff 0.9.3:

stubs\matplotlib\text.pyi:16:44: PYI061 `Literal[None, ...]` can be replaced with `Literal[...] | None`
   |
14 | from .transforms import Bbox, Transform
15 |
16 | def get_rotation(rotation: float | Literal[None, "horizontal", "vertical"]) -> float: ...
   |                                            ^^^^ PYI061
17 |
18 | class Text(Artist):
   |
   = help: Replace with `Literal[...] | None`

Found 1 error.

I expect:

Found 1 error (1 fixed, 0 remaining).

Unsafely autofixed to:

def get_rotation(rotation: float | Literal["horizontal", "vertical"] | None) -> float: ...

Or safely autofixed to:

def get_rotation(rotation: float | Union[Literal["horizontal", "vertical"], None]) -> float: ...