chore: update nox and test deps

[henryiii]

Description

Update some test deps and modernize the noxfile. The make_changelog script now supports PEP 723 runners, so you can, for example, do uv run make_changelog.py or pipx run make_changelog.py.

[Copilot]

Pull Request Overview

This PR updates testing dependencies and modernizes script runners, notably updating the shebangs for Python scripts and refining nox session usage.

• Update shebangs and add script metadata comments in tools/make_changelog.py and noxfile.py
• Upgrade nox version requirements and adjust nox session decorators
• Add and remove PYBIND11_NUMPY_1_ONLY flags in CI job configurations

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
tools/make_changelog.py	Updated shebang to use "uv run" and added metadata comments
noxfile.py	Updated shebang, version requirement, and modified session decorators
.github/workflows/ci.yml	Adjusted PYBIND11_NUMPY_1_ONLY flag usage in different CI job sections

Files not reviewed (1)

• tests/requirements.txt: Language not supported

Comments suppressed due to low confidence (3)

noxfile.py:57

• Setting default=False for the docs session changes its default execution behavior. Verify that this is intentional, and update documentation if needed.

@nox.session(reuse_venv=True, default=False)

.github/workflows/ci.yml:69

• The removal of the -DPYBIND11_NUMPY_1_ONLY=ON flag in the first build configuration may lead to inconsistent behavior compared to other job sections. Confirm whether this change is intentional and consistent with the desired build setup.

-DPYBIND11_NUMPY_1_ONLY=ON

.github/workflows/ci.yml:69

• Similarly, the removal of the -DPYBIND11_NUMPY_1_ONLY=ON flag in the second build configuration could cause inconsistencies across builds. Please verify that this removal aligns with the intended build configuration strategy.

-DPYBIND11_NUMPY_1_ONLY=ON

[rwgk]

Nice, thanks!