Update Jackson artificats to 2.9.6 which includes 3/4 of the issues t…

…hat we had on forks

The last is the enum -> class issues that was rejected:
cambridgeweblab/jackson-databind@54a988a

Included are:
FasterXML/jackson-module-jsonSchema#117
FasterXML/jackson-module-jsonSchema#112
FasterXML/jackson-module-jsonSchema@8aae855

pom.xml

@@ -13,7 +13,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId> <!-- for dependencies + plugin config such as git.properties -->
-        <version>2.3.7.RELEASE</version>
+        <version>2.3.9.RELEASE</version>
     </parent>
     <modules>
         <module>weblab-common</module>
@@ -91,9 +91,9 @@
 
 
         <!-- jackson - Spring 5 requires 2.9.x -->
-        <jackson.version>2.9.4</jackson.version>
-        <jackson-databind.version>2.9.4-CA-SNAPSHOT</jackson-databind.version>
-        <jackson-module-jsonSchema.version>2.9.4-CA-SNAPSHOT</jackson-module-jsonSchema.version>
+        <jackson.version>2.9.6</jackson.version>
+        <jackson-databind.version>2.9.6</jackson-databind.version> <!-- Note: doesn't include https://github.com/cambridgeweblab/jackson-databind/commit/54a988aba00b81d3664d5294827e3678c775152f -->
+        <jackson-module-jsonSchema.version>2.9.6</jackson-module-jsonSchema.version>
 
     </properties>