Update changelog for 2.11.15 #303

Job	Run time
lint-unit / markdown-link-check	17s
lint-unit / cookstyle	31s
lint-unit / check-metadata	0s
lint-unit / markdownlint-cli2	3s
lint-unit / rspec	56s
lint-unit / yamllint	9s
integration-windows (windows-latest, windows-default)	15m 2s
integration (almalinux-8, default)	1m 14s
integration (amazonlinux-2, default)	1m 10s
integration (amazonlinux-2, iptables)	1m 15s
integration (centos-7, default)	31s
integration (centos-stream-8, default)	32s
integration (debian-10, default)	32s
integration (debian-10, iptables)	30s
integration (debian-11, default)	1m 33s
integration (debian-11, iptables)	1m 17s
integration (fedora-latest, default)	49s
integration (fedora-latest, iptables)	49s
integration (opensuse-leap-15, default)	1m 36s
integration (ubuntu-1804, default)	36s
integration (ubuntu-1804, iptables)	34s
integration (ubuntu-2004, default)	1m 12s
integration (ubuntu-2004, iptables)	1m 15s
integration (rockylinux-8, default)	1m 24s
	33m 47s

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