Tests

Bump actions/upload-artifact from 5 to 6 #1221

Job	Run time
Build bloomberg-comdb2 from source	4m 21s
Build python-comdb2 source distribution	34s
Test suite (3.9)	43s
Test suite (3.14-dev)	33s
Test suite (3.13)	29s
Test suite (3.12)	38s
Test suite (3.10)	33s
Test suite (3.8)	39s
Test suite (3.11)	33s
	9m 3s

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