update v4.0.2 changelog (#3063) #21

Job	Run time
rocky	2s
Build binary (macos-13, pikiwidb-v4.0.2-macos-amd64.tar.gz)	1s
Build binary (ubuntu-latest, pikiwidb-v4.0.2-ubuntu-amd64.tar.gz)	2s
Release artifacts	0s
	5s

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