Bump jetty-server in /sparkler-core/sparkler-tests-base

Bumps [jetty-server](https://github.com/eclipse/jetty.project) from 9.4.0.v20161208 to 9.4.41.v20210516.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.0.v20161208...jetty-9.4.41.v20210516)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:production
...

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

Author: dependabot[bot]

sparkler-core/sparkler-tests-base/pom.xml

@@ -16,7 +16,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <jetty.version>9.4.0.v20161208</jetty.version>
+    <jetty.version>9.4.41.v20210516</jetty.version>
   </properties>
 
   <dependencies>