Test

ci: bump codecov-action to v6 to fix signature verification #1713

Job	Run time
get-environments	12s
hatch-test.py3.14-pre (PRE-RELEASE DEPENDENCIES)	2m 54s
hatch-test.py3.11-stable	4m 55s
hatch-test.py3.14-stable	6m 31s
Tests pass in all hatch environments	3s
	14m 35s

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