Update tests.yaml to include Python 3.15 and GraalPython

[lengau]

Added support for Python 3.15 and GraalPython versions.

Summary by Sourcery

Expand the test matrix to cover additional Python runtimes.

CI:

• Add CPython 3.15 (GIL and free-threaded variants) to the GitHub Actions test matrix.
• Add GraalPython 3.8, 3.10, 3.11, and 3.12 to the GitHub Actions test matrix.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Expands the GitHub Actions test matrix to run CI against new CPython 3.15 (GIL and free-threaded) and several GraalPython versions, ensuring broader runtime coverage.

File-Level Changes

Change	Details	Files
Expand CI test matrix to cover new Python runtimes.	Add CPython 3.15 GIL and 3.15 free-threaded variants to the Python version matrix. Add GraalPython 3.8, 3.10, 3.11, and 3.12 to the Python version matrix. Keep existing PyPy and other Python versions unchanged, with the prior Windows exclusion for PyPy 3.8 retained.	.github/workflows/tests.yaml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider verifying that the version labels 3.15+gil and 3.15+freethreaded match what your runner/setup action actually supports (e.g., actions/setup-python, pyenv, or uv) so the new matrix entries don't silently fail to resolve.
• If GraalPython is not available or stable on all platforms you run in this workflow (e.g., Windows), it may be worth adding corresponding exclude entries or comments similar to the existing pypy3.8 exclusion to avoid predictable job failures.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider verifying that the version labels `3.15+gil` and `3.15+freethreaded` match what your runner/setup action actually supports (e.g., `actions/setup-python`, `pyenv`, or `uv`) so the new matrix entries don't silently fail to resolve.
- If GraalPython is not available or stable on all platforms you run in this workflow (e.g., Windows), it may be worth adding corresponding `exclude` entries or comments similar to the existing `pypy3.8` exclusion to avoid predictable job failures.

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[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.