Update vaadin.version to v24.8.4

[xdev-renovate]

This PR contains the following updates:

Package	Type	Update	Change
com.vaadin:vaadin-maven-plugin (source)	build	patch	24.8.3 -> 24.8.4
com.vaadin:vaadin-bom (source)	import	patch	24.8.3 -> 24.8.4

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Release Notes

vaadin/platform (com.vaadin:vaadin-maven-plugin)

v24.8.4: Vaadin 24.8.4

Compare Source

This is a maintenance release for Vaadin 24.8. See 24.8.0 release notes for details and resources.

Changelogs

• Flow (24.8.4) and Hilla (24.8.3)
• Design System
  • Web Components (24.8.4)
  • Flow Components (24.8.4)
• TestBench (9.4.1)
• Feature Pack(24.8.0)
• Modernization Toolkit (Documentation)
  • Feature Pack (Documentation)
  • Dragonfly (Documentation)
  • Modernization Toolkit Analyzer (Analyzer for Eclipse, Analyzer for Maven)
• Multiplatform Runtime (MPR) (7.0.11)
• Router (2.0.0)
• Vaadin Kits
  • AppSec Kit (3.3.0)
  • Azure Kit (1.0.0)
  • Collaboration Engine (6.4.0)
  • Control Center (1.3.1)
  • Copilot (24.8.5)
  • Kubernetes Kit (2.4.2)
  • Observability Kit (3.1.0)
  • SSO Kit (3.1.2)
  • Swing Kit (2.4.0)

Official add-ons and plugins:

• Spring add-on (24.8.4)
• CDI add-on (15.2.1)
• Maven plugin (24.8.4)
• Gradle plugin (24.8.4)
• Quarkus plugin (2.2.1)

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