CI: add GHC 9.10 (#9914)
* CI: add GHC 9.10 * GHC 9.10 compat in testsuite: CPP symbols don't get passed to CC as eagearly Discussion: https://github.com/haskell/cabal/pull/9914#issuecomment-2077439625 Related GHC issue: ghc/ghc#21291 * GHC 9.10 compat in tests: disable tests regressing due to #9940