Bump spring-webmvc from 4.3.12.RELEASE to 5.2.20.RELEASE in /learn-sitech-project#86

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dependabot/maven/learn-sitech-project/org.springframework-spring-webmvc-5.2.20.RELEASEdufyun/learn-tech-collection:dependabot/maven/learn-sitech-project/org.springframework-spring-webmvc-5.2.20.RELEASECopy head branch name to clipboard