gha: use ghc-9.8

Author: coot

.github/workflows/haskell.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["8.10", "9.2", "9.4", "9.6", "9.10"]
+        ghc: ["8.10", "9.2", "9.4", "9.6", "9.8", "9.10"]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     env: