[experiments] Bump expirations for some EE experiments (#34310)

The work_stealing experiment may be deleted before the current deadline,
but it's worth extending it just in case.

src/core/lib/experiments/experiments.yaml

@@ -67,7 +67,7 @@
   test_tags: [resource_quota_test]
 - name: event_engine_client
   description: Use EventEngine clients instead of iomgr's grpc_tcp_client
-  expiry: 2023/10/01
+  expiry: 2024/01/21
   owner: hork@google.com
   test_tags: ["core_end2end_test", "event_engine_client_test"]
 - name: monitoring_experiment
@@ -119,7 +119,7 @@
 - name: work_stealing
   description:
     If set, use a work stealing thread pool implementation in EventEngine
-  expiry: 2023/10/01
+  expiry: 2023/11/01
   owner: hork@google.com
   test_tags: ["core_end2end_test"]
   allow_in_fuzzing_config: false