Zipkin 3.4.2

Zipkin 3.4.2 is a maintenance release, updating dependency versions to prevent problems such as bugs or CVEs.

Notable library updates:

• Update Spring Boot (address CVEs) and few other dependencies by @reta in #3778
• Update Spring / Netty /Micrometer related dependencies by @reta in #3779
• Routine dependency updates by @reta in #3780

Full Changelog: 3.4.1...3.4.2