Update Changelog for 8.2.1 #1270

Job	Run time
android	25m 44s
flash-samples	36s
docs	30s
air-samples (4.0.5)	3m 17s
air-samples (4.1.5)	3m 30s
html5-samples	1m 17s
air-samples (4.2.5)	3m 57s
ios	18m 0s
air-samples (4.3.1)	3m 21s
linux	14m 57s
macos	49m 34s
windows	15m 19s
package-haxelib	1m 59s
hashlink-samples (windows-latest)	43s
neko-samples (3.4.7, windows-latest)	42s
hashlink-samples (ubuntu-20.04)	17s
hashlinkc-samples (windows-latest)	1m 58s
neko-samples (3.4.7, ubuntu-20.04)	17s
hashlink-samples (macos-12)	41s
hashlinkc-samples (ubuntu-20.04)	1m 34s
neko-samples (3.4.7, macos-12)	57s
hashlinkc-samples (macos-12)	1m 41s
neko-samples (4.2.5, windows-latest)	44s
neko-samples (4.2.5, ubuntu-20.04)	18s
neko-samples (4.2.5, macos-12)	43s
notify	4s
	2h 32m 40s

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