[pom] Revert parent 27 and add temp patch for velocity license headers
[pom] Revert parent 27 and add temp patch for velocity license headers

mybatis/spring-boot-starter,hazendaz/mybatis-spring-boot,mybatis/mybatis-spring-boot,mybatis/spring-boot-starter,mybatis/mybatis-spring-boot,mybatis/spring-boot-starter,hazendaz/mybatis-spring-boot