typing-related failure on Python 3.8

[pitrou]

Describe the bug

We've started to see CI failures due to typing annotations in pytest-cython on our Python 3.8 build:

  File "/opt/conda/envs/arrow/lib/python3.8/site-packages/pytest_cython/plugin.py", line 77, in <module>
    def _without_suffixes(path: str | pathlib.Path) -> pathlib.Path:
TypeError: unsupported operand type(s) for |: 'type' and 'type'

https://github.com/apache/arrow/actions/runs/8526575827/job/23356153535?pr=40949#step:6:5476

Installed Packages
The following Python and installed packages versions being used:

• Python: 3.8.19
• Cython: 3.0.9
• Pytest: 8.1.1
• Pytest-cython: 0.3.0

[pitrou]

According to https://docs.python.org/3/library/typing.html#typing.Union, writing a union as X | Y is only supported from Python 3.10 onwards. Otherwise you need Union[X, Y] (which is admittedly much less pretty).

[pitrou]

Well, apparently it was fixed in #66 . Thanks @nsoranzo @lgpage !