Update changelog for v3.28.21 #7253

Job	Run time
Packaging: Config file (windows-latest, linked)	3m 29s
Packaging: Config file (windows-latest, default)	4m 49s
Packaging: Config file (macos-latest, nightly-latest)	2m 9s
Packaging: Config file (ubuntu-latest, default)	1m 2s
Packaging: Config file (ubuntu-latest, linked)	1m 16s
Packaging: Config file (macos-latest, linked)	2m 4s
Packaging: Config file (windows-latest, nightly-latest)	4m 9s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 32s
Packaging: Config file (macos-latest, default)	2m 1s
	22m 31s

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