Bump jetty.version in /frameworks/Java/jetty (#6190)

Bumps `jetty.version` from 9.4.19.v20190610 to 9.4.35.v20201120.

Updates `jetty-server` from 9.4.19.v20190610 to 9.4.35.v20201120
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.19.v20190610...jetty-9.4.35.v20201120)

Updates `jetty-servlet` from 9.4.19.v20190610 to 9.4.35.v20201120
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.19.v20190610...jetty-9.4.35.v20201120)

Updates `jetty-util-ajax` from 9.4.19.v20190610 to 9.4.35.v20201120
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.19.v20190610...jetty-9.4.35.v20201120)

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

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

frameworks/Java/jetty/pom.xml

@@ -11,7 +11,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
-        <jetty.version>9.4.19.v20190610</jetty.version>
+        <jetty.version>9.4.35.v20201120</jetty.version>
         <main.class>hello.handler.HelloWebServer</main.class>
     </properties>