Update health_check gem to 3.1.0
There are 178 commits in the latest minor release compared to 3.0.0, which we currently use: https://github.com/ianheggie/health_check/compare/v3.0.0...v3.1.0
I see commits related to Ruby 3 as well, so while the Ruby 3 build is green upstream we cannot assume this would would work with v3.0.0 of them gem.
I think we should update to v3.1.0 to benefit from these fixes.
Edited by Matthias Käppler