MbedTLS unsatisfiable requirements

That seems to fix it. What causes this problem?

Is it really OK to leave Manifest.toml untracked? I know Does Manifest.toml belong in the repository? - #2 by kristoffer.carlsson is a little dated but that made it sound like the best practice was including it. Am I misreading the intent? My interpretation of 10. Project.toml and Manifest.toml · Pkg.jl was similar.