Update changelog for 5.2.1 #294

Job	Run time
lint-unit / cookstyle	33s
lint-unit / markdownlint-cli2	5s
lint-unit / markdown-link-check	13s
lint-unit / rspec	35s
lint-unit / yamllint	5s
lint-unit / check-metadata	0s
integration (almalinux-8, default)	1m 4s
integration-macos (macos-latest, default)	1m 27s
integration (almalinux-9, default)	1m 3s
integration (amazonlinux-2, default)	55s
integration-windows (windows-latest, default)	14m 17s
integration (amazonlinux-2023, default)	55s
integration (centos-stream-9, default)	1m 0s
integration (debian-11, default)	1m 28s
integration (debian-12, default)	1m 20s
integration (fedora-latest, default)	1m 3s
integration (oraclelinux-8, default)	1m 13s
integration (oraclelinux-9, default)	1m 18s
integration (rockylinux-8, default)	1m 9s
integration (rockylinux-9, default)	1m 18s
integration (ubuntu-2004, default)	1m 19s
integration (ubuntu-2204, default)	1m 8s
integration (ubuntu-2404, default)	56s
	34m 24s

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