Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 6 to 7.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](astral-sh/setup-uv@v6...v7)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
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---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Not at all sure why this helps, but when assigning `None` instead, the
object is gone at the time of garbage collection.

- The first two run into issues because our meta type's `tp_getattro` is
  not overridden by its subclasses
- The last runs into a `PyErrOccurred` when trying to access its
  `__len__`, related to our sequence decoding logic

In Python 3.14, the objects __dict__ seems to already be half
deconstructed, leading to crashes during garbage collection.

Since gc in Python is single-threaded (I think :)), it should
be fine to have a single static for this. If that is not true,
we can always use a thread-local instead.

Python 3.14 introduced a new assertion that prevents us from using
PyObject_GenericSetAttr directly in our meta type. To work around
this, we manipulate the type dict directly.

This workaround is a simplified variant of Cython's workaround from
cython/cython#6325.

The relevant Python change is in
python/cpython#118454