Bump spring-webmvc from 4.3.24.RELEASE to 5.2.20.RELEASE

Bumps [spring-webmvc](https://github.com/spring-projects/spring-framework) from 4.3.24.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/v4.3.24.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>

pom.xml

diff --git a/pom.xml b/pom.xml
index 4f43924..47b421a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -96,7 +96,7 @@
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
-        <version>4.3.24.RELEASE</version>
+        <version>5.2.20.RELEASE</version>
         <exclusions>
           <exclusion>
             <groupId>commons-logging</groupId>