Bump spring-webmvc from 4.0.7.RELEASE to 5.3.18 in /starter-webapp#20

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dependabot/maven/starter-webapp/org.springframework-spring-webmvc-5.3.18grafpoo/MigratingToK8s:dependabot/maven/starter-webapp/org.springframework-spring-webmvc-5.3.18Copy head branch name to clipboard