ci: update ghc minors

Author: wolfgangwalther

.github/workflows/haskell.yml

@@ -13,7 +13,7 @@ jobs:
   build:
     strategy:
       matrix:
-        ghc: ['8.10.7', '9.2.6', '9.4.8', '9.6.3', '9.8.1']
+        ghc: ['8.10.7', '9.2.8', '9.4.8', '9.6.6', '9.8.4']
       fail-fast: false
 
     runs-on: ubuntu-latest