mybatis-spring-boot-2.2.0

This version is required Spring Boot 2.5+ (Please use the 2.1.x line on Spring Boot 2.4 or under). Here is the complete list of changes.

Dependencies Updates

• Upgrade to Spring Boot 2.5.0 #561
• Update to mybatis 3.5.7 #564
• Update to kotlin 1.5.10 #565 (using at sample)
• Update to groovy 3.0.8 #566 (using at sample)