Bump spring-boot-dependencies from 2.4.0 to 2.6.1

Bumps [spring-boot-dependencies](https://github.com/spring-projects/spring-boot) from 2.4.0 to 2.6.1.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.0...v2.6.1)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -314,7 +314,7 @@
         <version.org.google.guava>30.0-jre</version.org.google.guava>
 
         <!-- >>> Spring integration tests -->
-        <version.org.springframework.boot>2.4.0</version.org.springframework.boot>
+        <version.org.springframework.boot>2.6.1</version.org.springframework.boot>
 
         <!-- Maven plugins versions -->