Bump ligo-skymap from 1.0.5 to 1.0.6

Bumps [ligo-skymap](https://github.com/lpsinger/ligo.skymap) from 1.0.5 to 1.0.6.
- [Release notes](https://github.com/lpsinger/ligo.skymap/releases)
- [Changelog](https://github.com/lpsinger/ligo.skymap/blob/main/CHANGES.rst)
- [Commits](lpsinger/ligo.skymap@v1.0.5...v1.0.6)

---
updated-dependencies:
- dependency-name: ligo-skymap
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>