Bug: Circular dependency with Symbolics.jl

[0x0f0f0f]

I'm trying to update major version of SymbolicUtils.jl dependency on Symbolics.jl

See JuliaSymbolics/Symbolics.jl#1205

And related MR JuliaSymbolics/Symbolics.jl#1196

This causes a circular dependency, as this package depends on Symbolics = 5

[jverzani]

I'd think the correct thing to do here is to make the extension based on SymPyCore which will load when either the PyCall or PythonCall version is loaded. That should avoid the issue and widen the availability.

[ChrisRackauckas]

#69 (comment) is also part of the solution. Can that get a tag to check?