Tests fail in Haskell CI and stackage

[andreasabel]

• https://github.com/haskell-hvr/http-io-streams/actions/runs/12620781943/job/35166862325?pr=20#step:23:70
• http-io-streams test failure commercialhaskell/stackage#7644

[andreasabel]

For now, I have disabled the tests on CI:

• b619abd