Bump vaadin.version from 7.3.3 to 8.12.4 in /VaadinatorExample/Timesheet#67

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dependabot/maven/VaadinatorExample/Timesheet/vaadin.version-8.12.4akquinet/vaadinator:dependabot/maven/VaadinatorExample/Timesheet/vaadin.version-8.12.4Copy head branch name to clipboard