build(deps): bump spring-boot-starter-test (#635)

Bumps [spring-boot-starter-test](https://github.com/spring-projects/spring-boot) from 2.2.3.RELEASE to 2.2.4.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.2.3.RELEASE...v2.2.4.RELEASE)

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

factcast-integration-full/factcast-integration-full-tls/pom.xml

@@ -59,7 +59,7 @@
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
-      <version>2.2.3.RELEASE</version>
+      <version>2.2.4.RELEASE</version>
     </dependency>
   </dependencies>
   <build>