Bump jetty.version from 9.2.22.v20170606 to 9.4.21.v20190926#27

dependabot[bot] wants to merge 1 commit intomasterops4j/org.ops4j.pax.wicket:masterfrom

dependabot/maven/jetty.version-9.4.21.v20190926ops4j/org.ops4j.pax.wicket:dependabot/maven/jetty.version-9.4.21.v20190926Copy head branch name to clipboard