Update actions/setup-java from v3 to v4 across all repositories

[coderabbitai]

The GitHub Actions workflow is currently using actions/setup-java@v3, which is deprecated and will eventually stop working on GitHub Actions runners.

This issue tracks the need to update actions/setup-java from v3 to v4 across all Flowing Code repositories to ensure workflows continue to function properly.

Context:

• Related to PR build!: remove compatibility with Vaadin 23 AND feat!: replace classNameGenerator with partNameGenerator AND deprecate: deprecate footer/header styles #153
• Flagged in review comment: build!: remove compatibility with Vaadin 23 AND feat!: replace classNameGenerator with partNameGenerator AND deprecate: deprecate footer/header styles #153 (comment)
• Requested by: @javier-godoy

Action Required:
Update all GitHub Actions workflows across all repositories that use actions/setup-java@v3 to use actions/setup-java@v4 instead.