Add support to Events v4 serialization v2

Author: andclt

.github/workflows/aws-lambda-java-events-sdk-transformer.yml

@@ -26,6 +26,8 @@ jobs:
         java-version: 1.8
 
     # Install base module
+    - name: Install serialization with Maven
+      run: mvn -B install --file aws-lambda-java-serialization/pom.xml
     - name: Install events with Maven
       run: mvn -B install --file aws-lambda-java-events/pom.xml
     # Package target module