Bump spring-webmvc from 4.1.5.RELEASE to 5.2.20.RELEASE in /highlight_springmvc4#9

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dependabot/maven/highlight_springmvc4/org.springframework-spring-webmvc-5.2.20.RELEASEliqiangit/SpringBootSourceCode:dependabot/maven/highlight_springmvc4/org.springframework-spring-webmvc-5.2.20.RELEASECopy head branch name to clipboard