GUACAMOLE-1956: Update MyBatis to latest compatible (v3.5.15).

doc/licenses/mybatis-3.5.17/dep-coordinates.txt

@@ -1 +0,0 @@
-org.mybatis:mybatis:jar:3.5.17

doc/licenses/mybatis-3.5.19/README

@@ -1,7 +1,7 @@
 MyBatis (http://www.mybatis.org/mybatis-3/)
 -------------------------------------------
 
-    Version: 3.5.17
+    Version: 3.5.19
     From: 'MyBatis' (http://www.mybatis.org/)
     License(s):
         Apache v2.0

doc/licenses/mybatis-3.5.19/dep-coordinates.txt

@@ -0,0 +1 @@
+org.mybatis:mybatis:jar:3.5.19