Bump spring-boot-dependencies from 2.3.4.RELEASE to 2.4.0

Bumps [spring-boot-dependencies](https://github.com/spring-projects/spring-boot) from 2.3.4.RELEASE to 2.4.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.3.4.RELEASE...v2.4.0)

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

pom.xml

@@ -46,7 +46,7 @@ Integrates with Spring Data, Spring Data REST and Apache Solr</description>
 
     <properties>
         <ginkgo4j-version>1.0.12</ginkgo4j-version>
-        <springboot-version>2.3.4.RELEASE</springboot-version>
+        <springboot-version>2.4.0</springboot-version>
         <spring-cloud.version>Hoxton.SR9</spring-cloud.version>
         <commonsio-version>2.8.0</commonsio-version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>