use subtests from pytest 9.x

[mr-c]

Changelog Entry

To be copied to the draft changelog by merger:

• use subtests from pytest 9.x

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[mr-c]

Motivation: in Debian's development release we upgraded Pytest to version 9.x, which pytest-subtests plugin is not compatible with. It is a bit tedious to be compatible with both versions, so why not upgrade to Pytest 9.x properly.