Update changelog for v3.28.21 #852

Job	Run time
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 2s
Upload debug artifacts after failure in analyze (default)	3m 50s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 13s
Upload debug artifacts after failure in analyze (linked)	3m 2s
Download and check debug artifacts after failure in analyze	15s
	12m 22s

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