private static void showManualInstallMessage() {
		Util.infoMsg("Use your package manager to update jbang to the latest version,");
		Util.infoMsg("or visit https://jbang.dev to download and install it yourself.");
	}
Inform the user if the future returned a newer JBang version number, or
cancel the Future if it isn't done yet.
src/main/java/dev/jbang/util/VersionChecker.java