Bump astropy from 6.1.5 to 6.1.6 (#403)

Bumps [astropy](https://github.com/astropy/astropy) from 6.1.5 to 6.1.6.
- [Release notes](https://github.com/astropy/astropy/releases)
- [Changelog](https://github.com/astropy/astropy/blob/main/docs/changelog.rst)
- [Commits](astropy/astropy@v6.1.5...v6.1.6)

---
updated-dependencies:
- dependency-name: astropy
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>