Bump org.springframework:spring-core from 5.3.27 to 6.0.15

Bumps [org.springframework:spring-core](https://github.com/spring-projects/spring-framework) from 5.3.27 to 6.0.15.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.27...v6.0.15)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:development
...

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

pom.xml

@@ -103,7 +103,7 @@
  <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
- <spring.version>5.3.27</spring.version>
+ <spring.version>6.0.15</spring.version>
  <slf4j.version>1.6.1</slf4j.version>
  <jdk.version>1.8</jdk.version>
  <project.build.javaVersion>${jdk.version}</project.build.javaVersion>