Bump spring-webmvc in /springmvc5-custom-form-validation

Bumps [spring-webmvc](https://github.com/spring-projects/spring-framework) from 5.1.0.RELEASE to 5.2.20.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.1.0.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]

springmvc5-custom-form-validation/pom.xml

@@ -16,7 +16,7 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-webmvc</artifactId>
-			<version>5.1.0.RELEASE</version>
+			<version>5.2.20.RELEASE</version>
 		</dependency>
 
 		<!-- Hibernate Validator -->