Bump org.springframework:spring-core from 5.3.39 to 6.0.0

Bumps [org.springframework:spring-core](https://github.com/spring-projects/spring-framework) from 5.3.39 to 6.0.0.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.39...v6.0.0)

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

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

parent/pom.xml

@@ -117,7 +117,7 @@
         <groupId>org.springframework</groupId>
         <artifactId>spring-core</artifactId>
         <!-- Stick with 5.x because higher versions require Java Version > 11 -->
-        <version>5.3.39</version>
+        <version>6.0.0</version>
       </dependency>
 
       <dependency>