Don't run RIC 'pr' target when building serialization

Author: carlzogh

.github/workflows/aws-lambda-java-serialization.yml

@@ -31,8 +31,3 @@ jobs:
     # Package target module
     - name: Package serialization with Maven
       run: mvn -B package --file aws-lambda-java-serialization/pom.xml
-
-    # Test Runtime Interface Client
-    - name: Run 'pr' target
-      working-directory: ./aws-lambda-java-runtime-interface-client
-      run: make pr