Update changelog for v3.28.21 #870

Job	Run time
Upload debug artifacts after failure in analyze (linked)	3m 8s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 42s
Upload debug artifacts after failure in analyze (nightly-latest)	2m 54s
Upload debug artifacts after failure in analyze (default)	3m 2s
Download and check debug artifacts after failure in analyze	17s
	11m 3s

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