update max supported ghc to <9.16

Author: geekosaur

Cabal/src/Distribution/Simple/GHC.hs

@@ -168,7 +168,7 @@ configure verbosity hcPath hcPkgPath conf0 = do
   let implInfo = ghcVersionImplInfo ghcVersion
 
   -- Cabal currently supports GHC less than `maxGhcVersion`
-  let maxGhcVersion = mkVersion [9, 14]
+  let maxGhcVersion = mkVersion [9, 16]
   unless (ghcVersion < maxGhcVersion) $
     warn verbosity $
       "Unknown/unsupported 'ghc' version detected "