Try cleanup of brew

Author: mcbarton

.github/workflows/ci.yml

@@ -298,6 +298,7 @@ jobs:
             if [[ "${cling_on}" == "ON" ]]; then  
                 brew install llvm@15
                 brew remove llvm@18
+                brew cleanup
                 echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
                 echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
             else
@@ -779,6 +780,7 @@ jobs:
             if [[ "${cling_on}" == "ON" ]]; then  
                 brew install llvm@15
                 brew remove llvm@18
+                brew cleanup
                 echo "CC=$(brew --prefix llvm@15)/bin/clang" >> $GITHUB_ENV
                 echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> $GITHUB_ENV
             else