ci: bump actions/upload-artifact from 4 to 7 #37

Job	Run time
Memory Budget Check	13s
Performance Regression Gate	20s
Type check	18s
Test (Python 3.13 free-threaded, experimental)	12s
Test (Python 3.12)	22s
Lint	10s
Test (Python 3.13)	27s
	2m 2s

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