Bump vaadin-bom from 8.4.2 to 8.8.5 in /vaadin8-activiti#26

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dependabot/maven/vaadin8-activiti/com.vaadin-vaadin-bom-8.8.5cherkavi/java-web:dependabot/maven/vaadin8-activiti/com.vaadin-vaadin-bom-8.8.5Copy head branch name to clipboard