Re-enable with-utf8 and th-env
Re-enable with-utf8 and th-env

* The latest version of with-utf8 works with GHC up to and including 9.2.1.
* The latest version of th-env has been fixed to work with GHC 9.
jonschoning/stackage,simonmichael/stackage,Daniel-Diaz/stackage,mrkkrp/stackage