Update changelog for 1.2.0 #156

Job	Run time
lint-unit / cookstyle	32s
lint-unit / markdown-link-check	16s
lint-unit / check-metadata	0s
lint-unit / markdownlint-cli2	2s
lint-unit / rspec	34s
lint-unit / yamllint	6s
integration (almalinux-8, default)	2m 21s
integration (almalinux-9, default)	2m 34s
integration (amazonlinux-2023, default)	1m 55s
integration (centos-stream-9, default)	2m 40s
integration (debian-11, default)	3m 7s
integration (debian-12, default)	2m 29s
integration (opensuse-leap-15, default)	4m 19s
integration (rockylinux-8, default)	2m 34s
integration (rockylinux-9, default)	2m 30s
integration (ubuntu-2004, default)	3m 27s
integration (ubuntu-2204, default)	3m 8s
integration (ubuntu-2404, default)	2m 47s
	35m 21s

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