Bump jettyVersion from 9.4.28.v20200408 to 9.4.30.v20200611 (#59)

Bumps `jettyVersion` from 9.4.28.v20200408 to 9.4.30.v20200611.

Updates `jetty-server` from 9.4.28.v20200408 to 9.4.30.v20200611
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.28.v20200408...jetty-9.4.30.v20200611)

Updates `jetty-servlet` from 9.4.28.v20200408 to 9.4.30.v20200611
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.28.v20200408...jetty-9.4.30.v20200611)

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

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

Author: dependabot-preview[bot]

pom.xml

@@ -33,7 +33,7 @@
     <jaxbVersion>2.2.11</jaxbVersion>
     <jaxrsVersion>2.1</jaxrsVersion>
     <jerseyVersion>2.31</jerseyVersion>
-    <jettyVersion>9.4.28.v20200408</jettyVersion>
+    <jettyVersion>9.4.30.v20200611</jettyVersion>
     <jgitVersion>5.7.0.202003110725-r</jgitVersion>
     <jsonVersion>20160810</jsonVersion>
     <jsonUnitVersion>2.11.1</jsonUnitVersion>