I notice you are trying to install Polyhedra in your default environment - don’t do this, but rather create a project specific environment that only includes the packages you actually need for the specifc thing you’re doing. This is generally best practice as it minimizes versioning conflicts.
Now of course it might be possible that there are two packages you need at the same time which are actually incompatible, but this will be easier to diagnose if you’re in a fresh environment with only those packages in.
The relevant documentation is here: 4. Working with Environments · Pkg.jl