Bump jetty-webapp from 9.2.14.v20151106 to 9.4.34.v20201102 in /addon#431

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dependabot/maven/addon/org.eclipse.jetty-jetty-webapp-9.4.34.v20201102vaadin/touchkit:dependabot/maven/addon/org.eclipse.jetty-jetty-webapp-9.4.34.v20201102Copy head branch name to clipboard