[clbarnes]

Summary

Adds the recently-released python 3.15 to various test matrices.

For reviewers

• Are there any other places with hardcoded python versions?

Author attestation

• I am a human, these are my changes, and I have reviewed and understood every change and can explain why each is correct.

TODO

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/user-guide/*.md
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[clbarnes]

Blocked by cast-value-rs: zarr-developers/cast-value.rs#34

[d-v-b]

thanks for this! and thanks for raising the issue in the upstream package