Bump regions from 0.7 to 0.8

Bumps [regions](https://github.com/astropy/regions) from 0.7 to 0.8.
- [Release notes](https://github.com/astropy/regions/releases)
- [Changelog](https://github.com/astropy/regions/blob/main/CHANGES.rst)
- [Commits](astropy/regions@v0.7...v0.8)

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

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

requirements.txt

@@ -6,7 +6,7 @@ MOCpy >=0.13.*, < 0.14.0
 pandas==2.0.0
 plotly>=5.14.0.a, <=5.18.0
 pyvo>=1.4.1, <=1.4.2
-regions==0.7
+regions==0.8
 requests>=2.4.3
 seaborn >=0.12.*, <=0.13.*
 specutils<=1.12.*, >=1.9.*