Segmentation fault sometimes happens when running unit tests

See
- https://github.com/apache/pulsar-client-python/actions/runs/8242753702/job/22542297702?pr=202
- https://github.com/apache/pulsar-client-python/actions/runs/8242753702/job/22542206316?pr=202

```
...
2024-03-12T02:35:31.1396530Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ClientConnection:886 | [[::1]:52958 -> [::1]:6650] Handling incoming command: SEND_RECEIPT
2024-03-12T02:35:31.1398821Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ClientConnection:1498 | [[::1]:52958 -> [::1]:6650] Got receipt for producer: 0 -- msg: 3-- message id: (81,3,-1,-1)
2024-03-12T02:35:31.1401720Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ProducerImpl:940 | [persistent://public/default/my-python-topic-keyshare-sticky-1710210931.0501215, standalone-0-57] Received ack for msg 3
2024-03-12T02:35:31.1404238Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ClientConnection:861 | [[::1]:52958 -> [::1]:6650] Received a message from the server for consumer: 1
2024-03-12T02:35:31.1405802Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ConsumerImpl:516 | [persistent://public/default/my-python-topic-keyshare-sticky-1710210931.0501215, my-sub, 1] Received Message -- Size: 7
2024-03-12T02:35:31.1407524Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ConsumerImpl:564 | [persistent://public/default/my-python-topic-keyshare-sticky-1710210931.0501215, my-sub, 1] metadata.num_messages_in_batch() = 1
2024-03-12T02:35:31.1410975Z 2024-03-12 02:35:31.139 DEBUG [140455429797440] ConsumerImpl:566 | [persistent://public/default/my-python-topic-keyshare-sticky-1710210931.0501215, my-sub, 1] metadata.has_num_messages_in_batch() = 0
2024-03-12T02:35:31.1413569Z 2024-03-12 02:35:31.140 DEBUG [140455413016128] RetryableOperation:129 | Run operation get-partition-metadata-persistent://public/default/partitioned_topic_name_test, remaining time: 29900 ms
2024-03-12T02:35:35.1471950Z ....................................../tests/run-unit-tests.sh: line 28: 3956 Segmentation fault (core dumped) python3 pulsar_test.py
```

Start with the linked GitHub Actions runs and tests/run-unit-tests.sh, especially line 28 where python3 pulsar_test.py crashes. Reproduce the intermittent segmentation fault and inspect the unit-test execution around the logged client activity. Done means the relevant unit tests no longer terminate with a segmentation fault.

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