gha: use llvm@17 on MacOS

Author: coot

.github/workflows/haskell.yml

@@ -32,9 +32,9 @@ jobs:
     - name: Install LLVM (macOS)
       if: runner.os == 'macOS' && matrix.ghc == '8.10'
       run: |
-        brew install llvm@13
+        brew install llvm@17
         echo "LLVM_CONFIG=$(brew --prefix llvm@13)/bin/llvm-config" >> $GITHUB_ENV
-        echo "$(brew --prefix llvm@13)/bin" >> $GITHUB_PATH
+        echo "$(brew --prefix llvm@17)/bin" >> $GITHUB_PATH
 
     - name: Verify LLVM installation
       if: runner.os == 'macOS' && matrix.ghc == '8.10'