Bump spring-webmvc in /developer-tools/java-debugging/app

Bumps [spring-webmvc](https://github.com/spring-projects/spring-framework) from 4.3.25.RELEASE to 5.2.20.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.3.25.RELEASE...v5.2.20.RELEASE)

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

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

developer-tools/java-debugging/app/pom.xml

@@ -74,7 +74,7 @@
 	</dependencies>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<spring.release>4.3.25.RELEASE</spring.release>
+		<spring.release>5.2.20.RELEASE</spring.release>
 		<maven.compiler.source>1.8</maven.compiler.source>
 		<maven.compiler.target>1.8</maven.compiler.target>
 	</properties>