[#51] Support GHC 9.0 (#52)

* [#51] Support GHC 9.0

Resolves #51

* Apply suggestions from code review

Co-authored-by: Veronika Romashkina <vrom911@gmail.com>

* Use working GHC on Windows and macOS

Co-authored-by: Veronika Romashkina <vrom911@gmail.com>