configure: Bump GHC version to 9.11

Bumps haddock submodule.

configure.ac

@@ -13,7 +13,7 @@ dnl
 # see what flags are available. (Better yet, read the documentation!)
 #
 
-AC_INIT([The Glorious Glasgow Haskell Compilation System], [9.10.0], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
+AC_INIT([The Glorious Glasgow Haskell Compilation System], [9.11], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
     # Version on master must be X.Y (not X.Y.Z) for ProjectVersionMunged variable
     # to be useful (cf #19058). However, the version must have three components
     # (X.Y.Z) on stable branches (e.g. ghc-9.2) to ensure that pre-releases are

haddock @ 504d4c18

-Subproject commit 243fefaa40ddcc7c657a95e92f30cb79ec4ecb45
+Subproject commit 504d4c1842db93704b4c5e158ecc3af7050ba9fe