Bump vaadin.version from 7.6.0.beta1 to 8.13.0.beta1 in /appbuild/PolishedDemo - #3

Bump vaadin.version from 7.6.0.beta1 to 8.13.0.beta1 in /appbuild/PolishedDemo#3

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dependabot/maven/appbuild/PolishedDemo/vaadin.version-8.13.0.beta1dsuth1/jenkinsframeworkapp:dependabot/maven/appbuild/PolishedDemo/vaadin.version-8.13.0.beta1Copy head branch name to clipboard