Vaadin Quarkus add-on 2.0.0.alpha4 pre-release

Pre-release for Vaadin 24 based on Jakarta EE 9.

What's Changed

• test: fix missing lookup mock by @caalador in #91
• fix: updates after removal of deprecated Flow code by @MarcinVaadin in #92

Full Changelog: 2.0.0.alpha3...2.0.0.alpha4