message: Fix environment variable name for Homebrew
diff: @@ -176,7 +176,7 @@ curl --data '$github_json' https://api.github.com/repos/actor-framework/actor-fr
  if which brew &>/dev/null ; then
  file_url="https://github.com/actor-framework/actor-framework/archive/$tag_version.tar.gz"
  echo "\
  -export HOMEBREW_GITHUB_TOKEN=\$(cat "$token_path")
  +export HOMEBREW_GITHUB_API_TOKEN=\$(cat "$token_path")
  brew bump-formula-pr --message=\"Update CAF to version $tag_version\" --url=\"$file_url\" caf
  " >> .make-release-steps.bash
  fi
  