Bump vaadin.version from 7.6.3 to 8.12.4 in /src/main/resources/archetype-resources#2

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dependabot/maven/src/main/resources/archetype-resources/vaadin.version-8.12.4gitgabrio/vaadin-spring-kotlin-archetype:dependabot/maven/src/main/resources/archetype-resources/vaadin.version-8.12.4Copy head branch name to clipboard