Tests

tests: Ensure `dbapi2.Error` sets `cause` #907

Job	Run time
Build bloomberg-comdb2 from source	4m 15s
Build python-comdb2 source distribution	30s
Test suite (3.9)	39s
Test suite (3.10)	40s
Test suite (3.11)	31s
Test suite (3.12)	38s
Test suite (3.13)	32s
Test suite (3.8)	40s
	8m 25s

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