Bump org.springframework:spring-beans in /parent-pom (#89)

Bumps [org.springframework:spring-beans](https://github.com/spring-projects/spring-framework) from 5.3.19 to 5.3.20.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.19...v5.3.20)

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

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parent-pom/pom.xml

@@ -244,7 +244,7 @@
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-beans</artifactId>
-                <version>5.3.19</version>
+                <version>5.3.20</version>
             </dependency>
             <dependency>
                 <groupId>commons-logging</groupId>