update to jackson 2.9.6 due to CVEs

Author: pjfanning

build.gradle

@@ -33,6 +33,10 @@ subprojects {
     mavenCentral()
   }
 
+  ext {
+    jacksonVersion = '2.9.6'
+  }
+
   apply plugin: 'maven'
   apply plugin: 'maven-publish'
   apply plugin: 'java'
@@ -43,11 +47,11 @@ subprojects {
 
   //noinspection GroovyAssignabilityCheck
   dependencies {
-    compile 'com.fasterxml.jackson.core:jackson-core:2.4.2'
-    compile 'com.fasterxml.jackson.core:jackson-annotations:2.4.2'
-    compile 'com.fasterxml.jackson.core:jackson-databind:2.4.2'
+    compile "com.fasterxml.jackson.core:jackson-core:$jacksonVersion"
+    compile "com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion"
+    compile "com.fasterxml.jackson.core:jackson-databind:$jacksonVersion"
     compile 'com.google.guava:guava:17.0'
-    compile 'org.slf4j:slf4j-api:1.7.7'
+    compile 'org.slf4j:slf4j-api:1.7.25'
     compile 'commons-codec:commons-codec:1.9'
     testCompile 'junit:junit:4.11'
     testCompile 'org.powermock:powermock-module-junit4:1.6.6'