private static String retrieveLatestVersion() throws IOException {
		Path versionFile = Util.downloadFile(jbangVersionUrl, Settings.getCacheDir(), CONNECT_TIMEOUT);
		List<String> lines = Files.readAllLines(versionFile);
		if (!lines.isEmpty()) {
			return lines.get(0);
		}
		return null;
	}
Checks if we're running the latest version of JBang by comparing its version
against the latest version on GitHub.
src/main/java/dev/jbang/util/VersionChecker.java