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 `websocket-client` from 9.4.49.v20220914 to 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)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty.websocket:websocket-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -19,7 +19,7 @@
     <!-- versions -->
     <jackson.version>2.14.1</jackson.version>
     <jackson-databind.version>2.14.1</jackson-databind.version>
-    <jetty.version>9.4.49.v20220914</jetty.version>
+    <jetty.version>9.4.50.v20221201</jetty.version>
     <os72.protobuf-shaded.jar-version>0.9</os72.protobuf-shaded.jar-version>
     <os72.protobuf-shaded.plugin-version>${protobuf.version}</os72.protobuf-shaded.plugin-version>
     <os72.protobuf-shaded.version>3-11-1</os72.protobuf-shaded.version>