Support ghc 9.12

[erikd]

Library itself can be fixed with a Hackage metadata edit.

[erikd]

CI failures are due to CI infrastructure issues.

[erikd]

CI infrastructure seems fixed, but still getting a bunch of CI failures unrelated to this PR.

[TristanCacqueray]

Dear maintainers, could you please recheck the CI? This PR is also needed for ghc-9.10

[erikd]

CI results are weird. Have just built with both ghc-9.6.6 and ghc-9.10.1 and tests with both compilers passed.

For ghc-9.12.1 the failure in CI should not happen due to the allow-newer stanza in the cabal.project file. 🤷

[Saizan]

CI results are weird. Have just built with both ghc-9.6.6 and ghc-9.10.1 and tests with both compilers passed.

For ghc-9.12.1 the failure in CI should not happen due to the allow-newer stanza in the cabal.project file. 🤷

@erikd the CI workflow (generated with haskell-ci) creates a cabal.project from scratch, which doesn't appear to include an allow-newer stanza. I'm not familiar with the setup beyond that though.

[erikd]

@Saizan I am familiar with haskell-ci, but not when used like this. However the missing allow-newer should only affect the ghc-9.12 build.