Update changelog for 1.2.1 #161

Job	Run time
lint-unit / check-metadata	0s
lint-unit / markdown-link-check	14s
lint-unit / markdownlint-cli2	4s
lint-unit / cookstyle	25s
lint-unit / rspec	37s
lint-unit / yamllint	8s
integration (almalinux-8, default)	39s
integration (almalinux-9, default)	2m 12s
integration (amazonlinux-2023, default)	1m 43s
integration (centos-stream-9, default)	2m 12s
integration (debian-11, default)	39s
integration (debian-12, default)	39s
integration (opensuse-leap-15, default)	41s
integration (rockylinux-8, default)	43s
integration (rockylinux-9, default)	2m 26s
integration (ubuntu-2004, default)	46s
integration (ubuntu-2204, default)	38s
integration (ubuntu-2404, default)	38s
	15m 24s

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