Regen bindings to use is/is not None instead of equality checks

[cpcloud]

This PR implements proper None checks using is/is not, contains code regenerated from https://github.com/NVIDIA/cuda-python-private/pull/146.

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[cpcloud]

/ok to test

[rwgk]

Looks good to me.

Thoughts:

• In theory we could undo the corresponding change in the code generator, and still run pre-commit against the code generator code,
• but I think it's better to merge this PR, so we don't have to think so much what we're doing where.

[leofang]

@cpcloud feel free to merge, one thing that's technically missing is a release note entry, but for this one it is up to you if you wanna document it or not

[leofang]

Also plz regenerate and backport to 12.9.x

[cpcloud]

Is there a checklist of things that must be done when a PR is merged that ideally we can work towards automating?

[cpcloud]

backport is here #970

[leofang]

Is there a checklist of things that must be done when a PR is merged that ideally we can work towards automating?

There is a PR template which is ignored in this PR, though I don't think it matters much for the team members IMHO; most of time I just let it populate the text but does not read them either. I'd love to have more automation, but there are cases for which having a release note entry is too noisy, so an escape hatch is also needed.

[cpcloud]

I see. It looks like the PR template could use some TLC.

[leofang]

Yeah. For example, another thing that would be great to have is a backport reminder when a PR touches cuda-bindings on main, but I dunno how the PR template could help. Right now I just manually go through merged PRs every Sunday and check which one hasn't been backported 🤷 (This is tracked in #965 FWIW.)

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