Update changelog for v3.28.21 #7231

Job	Run time
Packaging: Action input (macos-latest, linked)	2m 25s
Packaging: Action input (windows-latest, linked)	2m 1s
Packaging: Action input (windows-latest, default)	2m 20s
Packaging: Action input (macos-latest, nightly-latest)	2m 15s
Packaging: Action input (ubuntu-latest, default)	1m 12s
Packaging: Action input (windows-latest, nightly-latest)	4m 14s
Packaging: Action input (ubuntu-latest, nightly-latest)	1m 34s
Packaging: Action input (macos-latest, default)	1m 29s
Packaging: Action input (ubuntu-latest, linked)	1m 8s
	18m 38s

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