GUACAMOLE-2139: Add automatic retrieval of license information where absent. Remove unused license info.

doc/licenses/duo-universal-sdk/LICENSE

@@ -2,8 +2,9 @@
 # URL:     https://duo.com/docs/duoweb
 # From:    'Cisco Systems'
 # License: Duo License 
+# Source:  https://raw.githubusercontent.com/duosecurity/duo_universal_java/refs/tags/${VERSION}/LICENSE
 #
-# --- BEGIN LICENSE FILE ---
+# --- BEGIN LICENSE FILE [1.3.1] ---
 Copyright (c) 2022 Cisco Systems, Inc. and/or its affiliates
 All rights reserved.
 
@@ -29,4 +30,4 @@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-# --- END LICENSE FILE ---
+# --- END LICENSE FILE [1.3.1] ---