Update changelog for v3.28.21 #7249

Job	Run time
Packaging: Action input (ubuntu-latest, default)	1m 5s
Packaging: Action input (ubuntu-latest, linked)	1m 30s
Packaging: Action input (windows-latest, linked)	7m 40s
Packaging: Action input (macos-latest, default)	2m 10s
Packaging: Action input (macos-latest, linked)	1m 54s
Packaging: Action input (windows-latest, nightly-latest)	6m 3s
Packaging: Action input (windows-latest, default)	2m 8s
Packaging: Action input (ubuntu-latest, nightly-latest)	1m 39s
Packaging: Action input (macos-latest, nightly-latest)	2m 16s
	26m 25s

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