Bump Jackson version to 2.9.4 to address critical vulnerability CVE-2018-5968

Author: sapessi

aws-serverless-java-container-core/pom.xml

@@ -15,7 +15,7 @@
     </parent>
 
     <properties>
-        <jackson.version>2.9.3</jackson.version>
+        <jackson.version>2.9.4</jackson.version>
         <jaxrs.version>2.1</jaxrs.version>
         <servlet.version>3.1.0</servlet.version>
     </properties>

aws-serverless-java-container-spring/pom.xml

@@ -17,7 +17,7 @@
     <properties>
         <spring.version>5.0.3.RELEASE</spring.version>
         <spring-security.version>5.0.1.RELEASE</spring-security.version>
-        <jackson.version>2.9.3</jackson.version>
+        <jackson.version>2.9.4</jackson.version>
     </properties>
 
     <dependencies>