fix(watson-version): update watsonVersion to 8.6.3

Author: kevinkowa

gradle.properties

@@ -1,5 +1,5 @@
 version=2.1.3
 group = com.ibm.watson.developer_cloud
-watsonVersion = 8.6.2
+watsonVersion = 8.6.3
 springVersion = 5.1.13.RELEASE
 springBootVersion = 2.2.0.RELEASE