Github Acitons CI with GHC 9.0 too

Author: Ericson2314

.github/workflows/haskell.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        ghc: ['8.0.2', '8.2.2', '8.4.4', '8.6.5', '8.8.4', '8.10.2']
+        ghc: ['8.0.2', '8.2.2', '8.4.4', '8.6.5', '8.8.4', '8.10.2', '9.0.1']
         os: ['ubuntu-latest', 'macos-latest']
         exclude:
           # There are some linker warnings in 802 on darwin that