Bump jetty.version from 9.4.49.v20220914 to 9.4.50.v20221201

Bumps `jetty.version` from 9.4.49.v20220914 to 9.4.50.v20221201.

Updates `jetty-maven-plugin` from 9.4.49.v20220914 to 9.4.50.v20221201
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.49.v20220914...jetty-9.4.50.v20221201)

Updates `jetty-server` from 9.4.49.v20220914 to 9.4.50.v20221201
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.49.v20220914...jetty-9.4.50.v20221201)

Updates `jetty-webapp` from 9.4.49.v20220914 to 9.4.50.v20221201
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.49.v20220914...jetty-9.4.50.v20221201)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-webapp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -90,7 +90,7 @@
     <scmpublish.content>${project.build.directory}/staging/mrm</scmpublish.content>
     <mavenVersion>2.2.1</mavenVersion>
     <mojo.java.target>1.8</mojo.java.target>
-    <jetty.version>9.4.49.v20220914</jetty.version>
+    <jetty.version>9.4.50.v20221201</jetty.version>
     <checkstyle.violation.ignore>MagicNumber</checkstyle.violation.ignore>
     <project.build.outputTimestamp>2022-06-27T16:20:47Z</project.build.outputTimestamp>
   </properties>