Bump spring-webmvc in /bitkylin-spring

Bumps [spring-webmvc](https://github.com/spring-projects/spring-framework) from 5.2.2.RELEASE to 5.2.4.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.2.2.RELEASE...v5.2.4.RELEASE)

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

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

Author: dependabot[bot]

bitkylin-spring/pom.xml

@@ -16,7 +16,7 @@
     <properties>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
-        <spring.version>5.2.2.RELEASE</spring.version>
+        <spring.version>5.2.4.RELEASE</spring.version>
         <java.version>1.8</java.version>
     </properties>