Version 7.20.0

Changes in Version 7.20.0:

• Upgrade to Camunda Platform 7.20.0
• Upgrade to Apache HttpComponents HttpClient 5
• Upgrade to Spring Boot 3.1.x
• Updated samples to Spring Security 6.1
• Upgrade to JDK 17

Special thanks to @cachescrubber for his outstanding help and support throughout the work on this update 🚀.