Bump spring-webmvc from 4.2.6.RELEASE to 5.2.20.RELEASE in /src/main/resources/archetype-resources#9

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dependabot/maven/src/main/resources/archetype-resources/org.springframework-spring-webmvc-5.2.20.RELEASEgitgabrio/vaadin-spring-kotlin-archetype:dependabot/maven/src/main/resources/archetype-resources/org.springframework-spring-webmvc-5.2.20.RELEASECopy head branch name to clipboard