Update changelog for 12.1.5 #233

Job	Run time
lint-unit / rspec	40s
lint-unit / markdownlint-cli2	5s
lint-unit / cookstyle	31s
lint-unit / markdown-link-check	32s
lint-unit / yamllint	8s
lint-unit / check-metadata	0s
integration-windows (windows-2016, resources)	39s
integration (almalinux-8, resources)	1m 33s
integration-macos (macos-latest, resources)	1m 49s
integration-windows (windows-2019, resources)	42s
integration (almalinux-8, source)	4m 12s
integration (amazonlinux-2, resources)	1m 20s
integration (amazonlinux-2, source)	3m 39s
integration (centos-7, resources)	1m 30s
integration (centos-7, source)	3m 20s
integration (centos-stream-8, resources)	1m 53s
integration (centos-stream-8, source)	3m 16s
integration (debian-10, resources)	1m 19s
integration (debian-10, source)	3m 21s
integration (debian-11, resources)	1m 28s
integration (debian-11, source)	3m 13s
integration (opensuse-leap-15, resources)	1m 55s
integration (opensuse-leap-15, source)	5m 1s
integration (rockylinux-8, resources)	1m 38s
integration (rockylinux-8, source)	3m 40s
integration (ubuntu-1804, resources)	1m 21s
integration (ubuntu-1804, source)	3m 23s
integration (ubuntu-2004, resources)	1m 15s
integration (ubuntu-2004, source)	3m 48s
Final Results	1s
	57m 12s

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