Bump spring-beans in /hippo4j-common (#467)

Bumps [spring-beans](https://github.com/spring-projects/spring-framework) from 5.2.20.RELEASE to 5.2.21.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.2.20.RELEASE...v5.2.21.RELEASE)

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

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hippo4j-common/pom.xml

@@ -12,7 +12,7 @@
     <properties>
         <spring-context.version>5.2.21.RELEASE</spring-context.version>
         <spring-web.version>5.2.15.RELEASE</spring-web.version>
-        <spring-beans.version>5.2.20.RELEASE</spring-beans.version>
+        <spring-beans.version>5.2.21.RELEASE</spring-beans.version>
     </properties>
 
     <dependencies>