Bump version.jetty from 9.4.27.v20200227 to 9.4.28.v20200408 (#1262)

Bumps `version.jetty` from 9.4.27.v20200227 to 9.4.28.v20200408.

Updates `jetty-server` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `jetty-servlet` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `jetty-continuation` from 9.4.27.v20200227 to 9.4.28.v20200408

Updates `jetty-webapp` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `jetty-servlets` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `websocket-server` from 9.4.27.v20200227 to 9.4.28.v20200408

Updates `javax-websocket-server-impl` from 9.4.27.v20200227 to 9.4.28.v20200408

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Aaron Klish <[email protected]>

pom.xml

@@ -79,7 +79,7 @@
         <!-- dependency versions -->
         <version.antlr4>4.8-1</version.antlr4>
         <version.logback>1.2.3</version.logback>
-        <version.jetty>9.4.27.v20200227</version.jetty>
+        <version.jetty>9.4.28.v20200408</version.jetty>
         <version.restassured>4.3.0</version.restassured>
         <version.jackson>2.10.3</version.jackson>
         <version.jersey>2.30.1</version.jersey>