Bump spring-webmvc from 5.2.3.RELEASE to 5.2.20.RELEASE in /boost-web-programming/Part3/BE/guestbook#117
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dependabot[bot] wants to merge 1 commit intomasterfrom dependabot/maven/boost-web-programming/Part3/BE/guestbook/org.springframework-spring-webmvc-5.2.20.RELEASE
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