tests.system.test_connector_object: test_connector_in_ThreadPoolExecutor failed

[flaky-bot]

Note: #1276 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: bcc1cbf
buildURL: https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/actions/runs/30509834290
status: failed

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (bcc1cbf), this test passed in one build (https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/actions/runs/30509834290) and failed in another build (https://github.com/GoogleCloudPlatform/cloud-sql-python-connector/actions/runs/30509834290).