added homebrew env variable and removed deprecated flag

Author: Aiden2244

setup/mac/binary_distribution/install_prereqs.sh

@@ -59,7 +59,11 @@ if [[ "${with_update}" -eq 1 ]]; then
   brew update || (sleep 30; brew update)
 fi
 
-brew bundle --file="${BASH_SOURCE%/*}/Brewfile" --no-lock
+# Do not genereate a brew lockfile. This behavior was previously implemented
+# with the now deprecated '--no-lock' flag. This env variable allows
+# for the behavior to be consistent without using the flag.
+export HOMEBREW_BUNDLE_NO_LOCK=1
+brew bundle --file="${BASH_SOURCE%/*}/Brewfile"
 
 if ! command -v pip3.12 &>/dev/null; then
   echo 'ERROR: pip3.12 is NOT installed. The post-install step for the python@3.12 formula may have failed.' >&2