;ci: linux, mac: ghc 9.8.2 -> 9.8.4

Author: simonmichael

.github/workflows/binaries-linux-x64.yml

@@ -52,7 +52,7 @@ jobs:
     - name: Install haskell tools with ghcup if needed
       run: |
         if [[ ! -x ~/.ghcup/bin/ghcup ]];     then mkdir -p ~/.ghcup/bin && curl https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup > ~/.ghcup/bin/ghcup && chmod +x ~/.ghcup/bin/ghcup; fi; printf "ghcup: "; ghcup --version
-        if [[ ! -x ~/.ghcup/bin/ghc-9.8.2 ]]; then ~/.ghcup/bin/ghcup install ghc 9.8.2      && ~/.ghcup/bin/ghcup set ghc 9.8.2;      fi; printf "ghc: "; ghc --version
+        if [[ ! -x ~/.ghcup/bin/ghc-9.8.4 ]]; then ~/.ghcup/bin/ghcup install ghc 9.8.2      && ~/.ghcup/bin/ghcup set ghc 9.8.2;      fi; printf "ghc: "; ghc --version
         if [[ ! -x ~/.ghcup/bin/cabal ]];     then ~/.ghcup/bin/ghcup install cabal 3.12.1.0 && ~/.ghcup/bin/ghcup set cabal 3.12.1.0; fi; printf "cabal: "; cabal --version
 
     - name: Update cabal package index

.github/workflows/binaries-mac-x64.yml

@@ -101,7 +101,7 @@ jobs:
       run: |
         if [[ ! -x ~/.ghcup/bin/ghcup ]];     then mkdir -p ~/.ghcup/bin && curl https://downloads.haskell.org/~ghcup/x86_64-apple-darwin-ghcup > ~/.ghcup/bin/ghcup && chmod +x ~/.ghcup/bin/ghcup; fi; printf "ghcup: "; ghcup --version
         if [[ ! -x ~/.ghcup/bin/stack ]];     then ~/.ghcup/bin/ghcup install stack 3.1.1   && ~/.ghcup/bin/ghcup set stack 3.1.1;   fi; printf "stack: "; stack --version
-        #if [[ ! -x ~/.ghcup/bin/ghc-9.8.2 ]]; then ~/.ghcup/bin/ghcup install ghc 9.8.2      && ~/.ghcup/bin/ghcup set ghc 9.8.2;     fi; printf "ghc: "; ghc --version
+        #if [[ ! -x ~/.ghcup/bin/ghc-9.8.4 ]]; then ~/.ghcup/bin/ghcup install ghc 9.8.2      && ~/.ghcup/bin/ghcup set ghc 9.8.2;     fi; printf "ghc: "; ghc --version
 
     - name: Install GHC with stack
       run: |