Use Homebrew Flex on Apple ARM CI

Author: quentin

sh/setup/install_macos_arm_deps.sh

@@ -8,9 +8,10 @@ set -e
 set -x
 
 # Install requirements of MAC OS X
-brew install libtool mcpp swig bison libffi gcc@15
+brew install libtool mcpp swig bison flex libffi gcc@15
 
 echo "$(brew --prefix bison)/bin" >> "$GITHUB_PATH"
+echo "$(brew --prefix flex)/bin" >> "$GITHUB_PATH"
 echo "PKG_CONFIG_PATH=$(brew --prefix libffi)/lib/pkgconfig" >> "$GITHUB_ENV"
 echo "CC=$(brew --prefix gcc@15)/bin/gcc-15" >> "$GITHUB_ENV"
 echo "CXX=$(brew --prefix gcc@15)/bin/g++-15" >> "$GITHUB_ENV"