Add ghc 9.6.1 to the matrix

Author: angerman

.github/workflows/haskell.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["8.10.7", "9.2.7", "9.4.4"]
+        ghc: ["8.10.7", "9.2.7", "9.4.4", "9.6.1"]
         cabal: ["3.8.1.0"]
         os: [ubuntu-latest, macos-latest, windows-latest]