Vaadin Spring Add-on 12.4.8 for Vaadin 14

What's Changed

• Upgrade jetty version to resolve CVE-2023-36479 (#1073)
• Update Spring Boot to 2.7.18 (#1075)
• Replace 'blocklist' and 'whitelist' with 'blocked' and 'allowed' (#1077)

New Contributors

• @jouni made their first contribution in #1077

Full Changelog: 12.4.7...12.4.8