Integration tests for Vaadin 23 fail

[javier-godoy]

Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.ClassWriter
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass (WebAppClassLoader.java:566)
at java.lang.ClassLoader.loadClass (ClassLoader.java:526)
at com.flowingcode.vaadin.jsonmigration.ClassInstrumentationUtil$InstrumentedClassLoader.generateBytecode (ClassInstrumentationUtil.java:254)
at com.flowingcode.vaadin.jsonmigration.ClassInstrumentationUtil$InstrumentedClassLoader.lambda$0 (ClassInstrumentationUtil.java:245)
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent (ConcurrentHashMap.java:1708)
at com.flowingcode.vaadin.jsonmigration.ClassInstrumentationUtil$InstrumentedClassLoader.defineInstrumentedClass (ClassInstrumentationUtil.java:244)