👷 Enable testing on Python 3.14

[denialhaag]

Description

This PR enables testing on Python 3.14.

Fixes #464

Checklist:

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
• I have added migration instructions to the upgrade guide (if needed).
• The changes follow the project's style guidelines and introduce no new warnings.
• The changes are fully tested and pass the CI checks.
• I have reviewed my own code changes.

[denialhaag]

As all dependencies are finally updated, this should be ready to go. 🎉

[burgholzer]

Nice! Cool to see this finally enabled 🙌

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• New Features

  • Added support for Python 3.14.

• Chores

  • Updated dependencies with Python 3.14-specific versions for compatibility.

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Walkthrough

This PR enables Python 3.14 testing support by extending the nox test matrix to include version 3.14, adding Python 3.14-specific dependency constraints, updating the changelog, and correcting a GitHub Actions workflow syntax issue in the attestation step.

Changes

Cohort / File(s)	Summary
Python 3.14 Version Matrix noxfile.py	Extended PYTHON_ALL_VERSIONS constant from ["3.10", "3.11", "3.12", "3.13"] to ["3.10", "3.11", "3.12", "3.13", "3.14"]
Python 3.14 Dependencies pyproject.toml	Added Python 3.14-specific dependency markers for numpy (≥2.3.2), numba (≥0.63.1), scipy (≥1.16.1), and multiprocess (≥0.70.19); also corrected author name spacing ("Peter-Jan H.S. Derks" → "Peter-Jan H. S. Derks")
CI/Workflow Configuration .github/workflows/cd.yml	Changed subject-path argument in attestation step from "dist/*" (quoted) to dist/* (unquoted)
Documentation CHANGELOG.md	Added entry to Unreleased > Added section: "Enable testing on Python 3.14" with corresponding PR reference

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• munich-quantum-toolkit/ddsim#674: Implements identical Python 3.14 enablement changes across noxfile.py, pyproject.toml, cd.yml, and CHANGELOG files.
• munich-quantum-toolkit/core#1246: Modifies the same noxfile.py Python-version matrix addition and coordinates pyproject dependency updates for Python 3.14 support.
• munich-quantum-toolkit/qmap#796: Makes matching code-level changes to cd.yml subject-path quoting, noxfile.py version matrix, and pyproject.toml Python 3.14 dependencies.

Poem

🐰 A nimble hop to futures bright,
Three-fourteen joins the testing flight,
Dependencies now aligned with care,
New versions floating through the air!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: enabling testing on Python 3.14, which is the primary objective of the PR.
Description check	✅ Passed	The description includes a clear summary of the change, references the fixed issue (#464), and provides a completed checklist showing implementation of required tasks.
Linked Issues check	✅ Passed	The PR fully implements the requirements from issue #464: adding Python 3.14 to the noxfile version matrix, adding Python 3.14-specific dependency entries, updating workflows, and documenting changes.
Out of Scope Changes check	✅ Passed	Changes include a minor author name formatting fix in pyproject.toml and a workflow syntax adjustment that are both marginal and acceptable alongside the main Python 3.14 enablement work.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@pyproject.toml`:
- Around line 55-65: The pyproject entry pins "multiprocess>=0.70.19;
python_version >= '3.14'" which is not available for CPython 3.14 and will break
installs; update the multiprocess dependency in pyproject.toml by removing the
Python 3.14 conditional and keeping a single compatible requirement (e.g., keep
"multiprocess>=0.70.17" or simply "multiprocess>=0.70.17" replacing both
multiprocess lines), or if you need a newer feature, find a multiprocess release
that actually provides cp314 wheels and pin to that version instead; edit the
multiprocess lines in the dependency list to reflect the chosen compatible
requirement.

[denialhaag]

Celebrated too early... 🫠

For the CI to pass also on Windows, we need a new release of pymatching and a subsequent update in ldpc.

Back to draft. 😞

[burgholzer]

Celebrated too early... 🫠

For the CI to pass also on Windows, we need a new release of pymatching and a subsequent update in ldpc.

Back to draft. 😞

Damn. Can we open issue in both to drive this? Or PRs if that's even easier?

[denialhaag]

Celebrated too early... 🫠
For the CI to pass also on Windows, we need a new release of pymatching and a subsequent update in ldpc.
Back to draft. 😞

Damn. Can we open issue in both to drive this? Or PRs if that's even easier?

I have opened oscarhiggott/PyMatching#179 to address the first issue. Once this change is released, I'll follow up on the ldpc side!