build(deps): bump astropy from 6.0.1 to 6.1.1

Bumps [astropy](https://github.com/astropy/astropy) from 6.0.1 to 6.1.1.
- [Release notes](https://github.com/astropy/astropy/releases)
- [Changelog](https://github.com/astropy/astropy/blob/main/docs/changelog.rst)
- [Commits](astropy/astropy@v6.0.1...v6.1.1)

---
updated-dependencies:
- dependency-name: astropy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,4 +1,4 @@
-astropy==6.0.1
+astropy==6.1.1
 matplotlib==3.9.0
 numpy==1.26.4
 scipy==1.13.0