* fix(packaging): require macOS 13.4, which the bundled speech engine needs
* fix(updater): keep the macOS requirement title clear of the close button
* fix(packaging): check out the Darwin floor table for adhoc builds and raise the cask floor
* refactor(updater): reuse the parsed Darwin floor for the macOS requirement
* fix(updater): use a margin to keep the macOS requirement title clear of the close button
* fix(updater): say the macOS requirement comes from Electron and the speech engine