Lock hexasphere version to 8.0.0

[geieredgar]

Objective

• hexasphere released version 8.1 with glam updated to 0.23, leading to duplicate glam versions in the dependency tree and causing CI to fail.

Solution

• Lock the hexasphere version to 8.0 for now, until all dependencies have updated glam.

[geieredgar]

All dependencies have updated glam, so closing in favor of #7883, since it will fix the CI and update glam to the latest version.