Bump version to 1.23.1

Author: DanBurton

haskell-src-exts.cabal

@@ -1,5 +1,5 @@
 Name:                   haskell-src-exts
-Version:                1.23.0
+Version:                1.23.1
 License:                BSD3
 License-File:           LICENSE
 Build-Type:             Simple
@@ -93,7 +93,7 @@ Test-Suite test
   other-modules:       Extensions
   GHC-Options:         -threaded -Wall
   Default-language:    Haskell2010
-  Build-depends:       base < 5,
+  Build-depends:       base,
                        mtl,
                        containers,
                        haskell-src-exts,