Use cabal 3.8 for release job

Author: wz1000

.github/scripts/env.sh

@@ -11,7 +11,7 @@ fi
 export PATH="$HOME/.local/bin:$PATH"
 
 export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
-export BOOTSTRAP_HASKELL_CABAL_VERSION="${CABAL_VER:-recommended}"
+export BOOTSTRAP_HASKELL_CABAL_VERSION="${CABAL_VER:-3.8.1.0}"
 export BOOTSTRAP_HASKELL_ADJUST_CABAL_CONFIG=yes
 export BOOTSTRAP_HASKELL_INSTALL_NO_STACK=yes