Delete custom cached_property in favor of functools.cached_property

[yangdanny97]

Change try/except import to use sys.version_info check instead, so that type checkers can statically determine the type.

Since podman only supports Python 3.9+, the custom cached_property impl for older versions is no longer necessary.

See facebook/pyrefly#1758 for context

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[inknos]

@yangdanny97 thanks for the PR. would you mind change the subject line length of the commit to <72 chars so the bot is happy?

also, podman-py supports python > 3.9, so the if line can be removed.

[yangdanny97]

Oh, we can just delete that file entirely then if Python 3.8 support is dropped

[inknos]

yes, and the references in other files. do you plan to take care of it as part of this PR?

[yangdanny97]

Yep, the updated version of the PR deletes the custom cached_property entirely and updates all the call sites to use functools.cached_property