Switch to 9.8.1 released version

Author: wz1000

.github/actions/setup-build/action.yml

@@ -36,7 +36,6 @@ runs:
       with:
         ghc-version  : ${{ inputs.ghc   }}
         cabal-version: ${{ inputs.cabal }}
-        ghcup-release-channel: "https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-prereleases-0.0.7.yaml"
         enable-stack: false
 
     - if: inputs.os == 'Windows'

.github/workflows/supported-ghc-versions.json

@@ -1 +1 @@
-[ "9.8.0.20230929", "9.6", "9.4" , "9.2" , "9.0" ]
+[ "9.8", "9.6", "9.4" , "9.2" , "9.0" ]