Tests

Drop dependency on `pytz` for Python 3.14+ #952

Job	Run time
Build bloomberg-comdb2 from source	5m 50s
Build python-comdb2 source distribution	28s
Test suite (3.13)	47s
Test suite (3.11)	34s
Test suite (3.9)	43s
Test suite (3.12)	36s
Test suite (3.14-dev)	48s
Test suite (3.10)	39s
Test suite (3.8)	35s
	11m 0s

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