update macos intel runner

[ianhi]

The nightly wheels job has been cancelled for some time now because the macos-13 runner was removed in december 2025.

see: https://github.com/zarr-developers/numcodecs/actions/workflows/wheel.yaml?query=event%3Aschedule

This is the fix for that as I understand it.

TODO:

• Unit tests and/or doctests in docstrings
• Tests pass locally
• Docstrings and API docs for any new/modified user-facing classes and functions
• Changes documented in docs/release.rst
• Docs build locally
• GitHub Actions CI passes
• Test coverage to 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 2.14%. Comparing base (e0ddee6) to head (a447b33).

❌ Your project check has failed because the head coverage (2.14%) is below the target coverage (100.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (e0ddee6) and HEAD (a447b33). Click for more details.

HEAD has 20 uploads less than BASE

Flag	BASE (e0ddee6)	HEAD (a447b33)
	23	3

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #819       +/-   ##
==========================================
- Coverage   99.33%   2.14%   -97.19%     
==========================================
  Files          26      26               
  Lines         898     884       -14     
==========================================
- Hits          892      19      -873     
- Misses          6     865      +859     

see 25 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ianhi]

oh boy

[ianhi]

these are all seemingly unrelated:

FAILED numcodecs/tests/test_json.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)
FAILED numcodecs/tests/test_msgpacks.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)
FAILED numcodecs/tests/test_pickles.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)
FAILED numcodecs/tests/test_vlen_array.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)
FAILED numcodecs/tests/test_vlen_bytes.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)
FAILED numcodecs/tests/test_vlen_utf8.py::test_backwards_compatibility - numpy.exceptions.VisibleDeprecationWarning: dtype(): align should be passed as Python or NumPy boolean but got `align=0`. Did you mean to pass a tuple to create a subarray type? (Deprecated NumPy 2.4)