Bump GHC version to 9.0

Author: bgamari

haddock-api/haddock-api.cabal

@@ -45,7 +45,7 @@ library
   -- this package typically supports only single major versions
   build-depends: base            ^>= 4.15.0
                , Cabal           ^>= 2.4.0
-               , ghc             ^>= 8.11
+               , ghc             ^>= 9.0
                , ghc-paths       ^>= 0.1.0.9
                , haddock-library ^>= 1.8.0
                , xhtml           ^>= 3000.2.2

haddock-api/src/Haddock/InterfaceFile.hs

@@ -83,7 +83,7 @@ binaryInterfaceMagic = 0xD0Cface
 -- (2) set `binaryInterfaceVersionCompatibility` to [binaryInterfaceVersion]
 --
 binaryInterfaceVersion :: Word16
-#if MIN_VERSION_ghc(8,11,0) && !MIN_VERSION_ghc(8,13,0)
+#if MIN_VERSION_ghc(9,0,0) && !MIN_VERSION_ghc(9,1,0)
 binaryInterfaceVersion = 34
 
 binaryInterfaceVersionCompatibility :: [Word16]

haddock.cabal

@@ -33,7 +33,7 @@ bug-reports:          https://github.com/haskell/haddock/issues
 copyright:            (c) Simon Marlow, David Waern
 category:             Documentation
 build-type:           Simple
-tested-with:          GHC==8.12.*, GHC==8.10.*, GHC==8.8.1
+tested-with:          GHC==9.0.*, GHC==8.10.*
 
 extra-source-files:
   CHANGES.md
@@ -80,7 +80,7 @@ executable haddock
       Cabal >= 1.10,
       ghc-boot,
       ghc-boot-th,
-      ghc == 8.11.*,
+      ghc == 9.0.*,
       bytestring,
       parsec,
       text,