Update changelog for v3.28.21 #9859

Job	Run time
analyze-actions	56s
check-codeql-versions	31s
analyze-javascript (ubuntu-22.04)	4m 1s
analyze-javascript (ubuntu-22.04, linked)	3m 57s
analyze-javascript (windows-2022)	5m 18s
analyze-javascript (ubuntu-24.04, linked)	3m 54s
analyze-javascript (ubuntu-24.04)	4m 14s
analyze-javascript (windows-2022, linked)	5m 14s
analyze-javascript (macos-13)	5m 49s
analyze-javascript (macos-14)	8m 0s
analyze-javascript (windows-2025)	6m 14s
analyze-javascript (macos-14, linked)	7m 23s
analyze-javascript (macos-13, linked)	7m 5s
analyze-javascript (windows-2025, linked)	6m 4s
analyze-javascript (macos-15, linked)	8m 28s
analyze-javascript (macos-15)	10m 52s
	1h 28m 0s

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