Upgrade folio-spring-base by bumping Spring Boot (spring-boot-starter-parent) from 2.5.2 to 2.6.x for Lotus.
Spring Boot 2.5.x end of support: 2022-05-19 https://spring.io/projects/spring-boot#support
Lotus official release: 2022-04-04
Spring Boot 2.5.x support ends long before FOLIO releases Morning Glory in ~ August 2022.
Therefore we need Spring Boot 2.6.x for Lotus to get security fixes if needed.