Pin extinction to latest version 0.4.8

[pyup-bot]

This PR pins extinction to the latest release 0.4.8.

Changelog

0.4.8

What's Changed
* Add support for python 3.14/3.14t and increase requires-python to >= 3.8 by lukeshingles in https://github.com/sncosmo/extinction/pull/33

**Full Changelog**: https://github.com/sncosmo/extinction/compare/v0.4.7...v0.4.8

0.4.7

What's Changed
* Add support for Python 3.13 and numpy 2 by lukeshingles in https://github.com/sncosmo/extinction/pull/27

New Contributors
* lukeshingles made their first contribution in https://github.com/sncosmo/extinction/pull/27

**Full Changelog**: https://github.com/sncosmo/extinction/compare/v0.4.6...v0.4.7

0.4.6

Note: All releases since v0.4.0 have been for build system modernization of one sort or another.

Build system updates

- This release includes wheels uploaded to PyPI

Bugfixes

- Addressed `numpy.float` type deprecation warning introduced in numpy v1.20.

0.3.0

- Make `Fitzpatrick99` fully agree with IDL FM_UNRED (and original paper) by using natural boundary condition in cubic spline
- Speed up Fitzpatrick99() initialization from about 500us to 1us
- Speed up Fitzpatrick99 evaluation from about 50us to 6us (10 points)
- Add keyword argument for `r_v` to `fitzpatrick99` function so that `extinction.fitzpatrick99(wave, a_v, r_v)` works. This is consistent with calling conventions for `ccm89`, `odonnell94`, etc.

Links

• PyPI: https://pypi.org/project/extinction
• Changelog: https://data.safetycli.com/changelogs/extinction/
• Repo: http://github.com/kbarbary/extinction