Bump spring-core from 5.1.20.RELEASE to 5.2.23.RELEASE

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.1.20.RELEASE to 5.2.23.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.1.20.RELEASE...v5.2.23.RELEASE)

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

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

Author: dependabot[bot]

pom.xml

@@ -48,7 +48,7 @@
 		<maven-compiler.version>3.7.0</maven-compiler.version>
 		<spring.boot.version>2.2.13.RELEASE</spring.boot.version>
 		<spring.cloud.version>2.0.2.RELEASE</spring.cloud.version>
-		<springframework.version>5.1.20.RELEASE</springframework.version>
+		<springframework.version>5.2.23.RELEASE</springframework.version>
 		<kotlin-stdlib.version>1.6.0</kotlin-stdlib.version>
 		<springframework-plugin.version>1.2.0.RELEASE</springframework-plugin.version>
 		<swagger-version>2.9.2</swagger-version>