Bump jetty.version from 9.4.27.v20200227 to 9.4.28.v20200408

Bumps `jetty.version` 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 `websocket-server` from 9.4.27.v20200227 to 9.4.28.v20200408

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

modules/jooby-bom/pom.xml

@@ -52,7 +52,7 @@
   <javax.inject.version>1</javax.inject.version>
   <jboss-modules.version>1.10.0.Final</jboss-modules.version>
   <jdbi.version>3.12.2</jdbi.version>
-  <jetty.version>9.4.27.v20200227</jetty.version>
+  <jetty.version>9.4.28.v20200408</jetty.version>
   <jfiglet.version>0.0.8</jfiglet.version>
   <jmespath-java.version>1.11.757</jmespath-java.version>
   <jooby-maven-plugin.version>2.8.1-SNAPSHOT</jooby-maven-plugin.version>

pom.xml

@@ -60,7 +60,7 @@
 
     <!-- Server -->
     <undertow.version>2.0.29.Final</undertow.version>
-    <jetty.version>9.4.27.v20200227</jetty.version>
+    <jetty.version>9.4.28.v20200408</jetty.version>
     <netty.version>4.1.48.Final</netty.version>
     <boringssl.version>2.0.27.Final</boringssl.version>