Allow warp-3.4

[ysangkok]

Tested using

cabal test --enable-tests -c 'warp>=3.4' -w ghc-9.8.2

[ysangkok]

@maksbotan Would be good to make this revision too, to make it possible for Stackage to upgrade now that the other Servant packages were revised. Cabal file on Hackage: https://hackage.haskell.org/package/servant-blaze-0.9.1/src/servant-blaze.cabal

[maksbotan]

Done!

Do you know if Stackage will notify us if something is still not building?

[ysangkok]

I don't think the Stackage curators are sending out e-mails. And the Servant packages are all marked as owned by a mailing list: Haskell Servant <haskell-servant-maintainers@googlegroups.com>. We could definitely get that changed by submitting a PR to build-constraints.yaml, which is the file that defines who is the owner of each package. I wouldn't want to be responsible for the Servant packages, given I only use it on the side. But there are many people who use it professionally, it would be best for them to sign up.

[ysangkok]

Packages can actually be owned by a Github user, which would then receive notifications. That's what I think the Stackage curators prefer to use.