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

doc/licenses/kotlinx-serialization/NOTICE.txt

@@ -2,8 +2,9 @@
 # URL:     https://github.com/Kotlin/kotlinx.serialization
 # From:    'JetBrains s.r.o and respective authors and developers'
 # License: Apache v2.0
+# Source:  https://raw.githubusercontent.com/Kotlin/kotlinx.serialization/refs/tags/v${VERSION}/license/NOTICE.txt
 #
-# --- BEGIN LICENSE FILE ---
-kotlinx.serialization library.
-Copyright 2017-2023 JetBrains s.r.o and respective authors and developers
-# --- END LICENSE FILE ---
+# --- BEGIN LICENSE FILE [1.9.0] ---
+   kotlinx.serialization library.
+   Copyright 2017-2019 JetBrains s.r.o and respective authors and developers
+# --- END LICENSE FILE [1.9.0] ---