Bump spring-webmvc in /spring/spring-scheduling-annotation

Bumps [spring-webmvc](https://github.com/spring-projects/spring-framework) from 5.1.3.RELEASE to 5.2.20.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.1.3.RELEASE...v5.2.20.RELEASE)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

spring/spring-scheduling-annotation/pom.xml

@@ -21,7 +21,7 @@
     </build>
 
     <properties>
-        <spring-base-version>5.1.3.RELEASE</spring-base-version>
+        <spring-base-version>5.2.20.RELEASE</spring-base-version>
     </properties>
 
     <dependencies>