Spring Cloud Azure tasks for a new Spring Boot release

Background

When Spring Boot released a new version, we need do the following tasks. It's suggested to copy the following list into a new GitHub issue to track these tasks.

Task list

• Before azure-sdk-for-java in band release

  • Read spring boot release notes. Sample: Spring-Boot-2.6-Release-Notes.
  • Upgrade external dependencies' version according to spring-boot-dependencies and spring-cloud-dependencies. Refer to related readme

• After azure-sdk-for-java in band release.

  • Update azure-spring-boot-samples
  • Update CHANGELOG.
  • Update Reference doc.
  • Update MS docs.
  • Update related wiki pages: Spring Cloud Azure Timeline, Spring Support Multiple Versions, Spring Versions Mapping.