Can't find a compatible package for Req

[dev590t]

Reproduce the bug

a pyproject.toml with only one dependency:

[tool.pyflow.dependencies]
ccxt = "1.72.98"

run:

$ pyflow install
opts Opt { subcmds: Install { packages: [], dev: false }, color: None }
Can't find a compatible package for Req { name: "yarl", constraints: [Constraint { type_: Exact, version: 1.7.2 }], extra: None, sys_platform: None, python_version: Some([Constraint { type_: Gte, version: 3.5.2 }]), install_with_extras: None, path: None, git: None }

If I use other packager manager like pdm, the dependency can be solved without problem.