Bump vaadin.version from 19.0.0.alpha2 to 20.0.0.beta1 in /data-entry/invoice-editor/invoice-editor-flow#200

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dependabot/maven/data-entry/invoice-editor/invoice-editor-flow/vaadin.version-20.0.0.beta1vaadin/ui-examples:dependabot/maven/data-entry/invoice-editor/invoice-editor-flow/vaadin.version-20.0.0.beta1Copy head branch name to clipboard