Bump jetty-server from 9.4.19.v20190610 to 9.4.41.v20210516#2

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dependabot/maven/org.eclipse.jetty-jetty-server-9.4.41.v20210516vaadin-learning-center/flow-layout-nested-layouts:dependabot/maven/org.eclipse.jetty-jetty-server-9.4.41.v20210516Copy head branch name to clipboard