Update to latest vaadin version

[CedricNdong]

I'm experiencing a version conflict with @vaadin/polymer-legacy-adapter after adding the addon to my project. When running ./gradlew vaadinPrepareFrontend, I get multiple warnings about different versions being used:

Multiple npm versions for @vaadin/polymer-legacy-adapter found: [24.5.3, 23.2.8].
First version found '24.5.3' will be considered.

Would it be possible to update the dependency in the addon to match the latest version ? This would help avoid version conflicts when integrating your addon into Vaadin projects.

Thanks in advance for your help!