build: bump jetty.version in /webtau-test-server (#735)

Bumps `jetty.version` from 9.4.34.v20201102 to 9.4.35.v20201120.

Updates `jetty-server` from 9.4.34.v20201102 to 9.4.35.v20201120
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.34.v20201102...jetty-9.4.35.v20201120)

Updates `jetty-webapp` from 9.4.34.v20201102 to 9.4.35.v20201120
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.34.v20201102...jetty-9.4.35.v20201120)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

webtau-test-server/pom.xml

@@ -28,7 +28,7 @@
     <artifactId>webtau-test-server</artifactId>
 
     <properties>
-        <jetty.version>9.4.34.v20201102</jetty.version>
+        <jetty.version>9.4.35.v20201120</jetty.version>
     </properties>
 
     <dependencies>