GUACAMOLE-957: Add license information for SnakeYAML version required by updated Jackson.

doc/licenses/jackson-2.13.1/dep-coordinates.txt

@@ -1,4 +1,5 @@
 com.fasterxml.jackson.core:jackson-databind:jar:2.13.1
 com.fasterxml.jackson.core:jackson-core:jar:2.13.1
 com.fasterxml.jackson.core:jackson-annotations:jar:2.13.1
+com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.13.1
 com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.13.1

doc/licenses/snakeyaml-1.27/README

@@ -1,8 +0,0 @@
-SnakeYAML (https://bitbucket.org/asomov/snakeyaml/)
----------------------------------------------------
-
-    Version: 1.27
-    From: 'Andrey Somov' (https://bitbucket.org/asomov/)
-    License(s):
-        Apache v2.0
-

doc/licenses/snakeyaml-1.27/dep-coordinates.txt

@@ -1 +0,0 @@
-org.yaml:snakeyaml:jar:1.27

doc/licenses/snakeyaml-1.28/README

@@ -0,0 +1,8 @@
+SnakeYAML (https://bitbucket.org/snakeyaml/snakeyaml/
+-----------------------------------------------------
+
+    Version: 1.28
+    From: 'Andrey Somov' (https://bitbucket.org/asomov/)
+    License(s):
+        Apache v2.0
+

doc/licenses/snakeyaml-1.28/dep-coordinates.txt

@@ -0,0 +1 @@
+org.yaml:snakeyaml:jar:1.28