GUACAMOLE-2139: Migrate all license information to new automated format.

doc/licenses/kotlinx-serialization/NOTICE.txt

@@ -0,0 +1,9 @@
+# Name:    Kotlin Serialization
+# URL:     https://github.com/Kotlin/kotlinx.serialization
+# From:    'JetBrains s.r.o and respective authors and developers'
+# License: Apache v2.0
+#
+# --- BEGIN LICENSE FILE ---
+kotlinx.serialization library.
+Copyright 2017-2023 JetBrains s.r.o and respective authors and developers
+# --- END LICENSE FILE ---

doc/licenses/kotlinx-serialization/dep-coordinates.txt

@@ -0,0 +1,2 @@
+org.jetbrains.kotlinx:kotlinx-serialization-json-jvm:jar:*
+org.jetbrains.kotlinx:kotlinx-serialization-core-jvm:jar:*