Bump vaadin.version from 19.0.0.alpha2 to 20.0.0.alpha7 in /data-entry/invoice-editor/invoice-editor-flow#199

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dependabot/maven/data-entry/invoice-editor/invoice-editor-flow/vaadin.version-20.0.0.alpha7vaadin/ui-examples:dependabot/maven/data-entry/invoice-editor/invoice-editor-flow/vaadin.version-20.0.0.alpha7Copy head branch name to clipboard