Fix VMM tests

[leofang]

Description

follow-up of #1242
closes #1276

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[leofang]

/ok to test 3dd1bc5

[leofang]

Ah... On the self-hosted Windows runners we don't have MSVC, so CFFI would not work 😞

[github-actions]

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[kkraus14]

My 2c: having this OBJECT_ATTRIBUTE directly exposed to cuda.core doesn't make sense where I wonder if we can pull out the key functionality that is needed from it and support those more directly via args/kwargs to hide this as an implementation detail from users. If they need the low level functionality they can always reach for cuda.bindings.driver.

[leofang]

Discussed during the meeting, we want to hide this for now and raise an exception asking users to reach out to us if they use handle_type="win32". I'll prepare another PR to do this.