Bump spring.boot.version from 2.6.7 to 2.7.0

Bumps `spring.boot.version` from 2.6.7 to 2.7.0.

Updates `spring-boot-starter` from 2.6.7 to 2.7.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.7...v2.7.0)

Updates `spring-boot-maven-plugin` from 2.6.7 to 2.7.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.6.7...v2.7.0)

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

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

mongo-axon-example/pom.xml

@@ -32,7 +32,7 @@
     <properties>
         <kotlin.version>1.6.21</kotlin.version>
         <kotlin-logging-jvm.version>2.1.21</kotlin-logging-jvm.version>
-        <spring.boot.version>2.6.7</spring.boot.version>
+        <spring.boot.version>2.7.0</spring.boot.version>
     </properties>
 
     <dependencies>