Update changelog for 8.2.6 #273

Job	Run time
lint-unit / check-metadata	0s
lint-unit / markdown-link-check	30s
lint-unit / cookstyle	33s
lint-unit / markdownlint-cli2	4s
lint-unit / rspec	7m 31s
lint-unit / yamllint	9s
integration (windows-latest, default)	5m 56s
integration (windows-latest, disable-default)	9m 40s
integration (windows-latest, app)	11m 21s
integration (windows-latest, config-property)	13m 33s
integration (windows-latest, manager)	11m 7s
integration (windows-latest, manager-permission)	12m 49s
integration (windows-latest, module)	12m 34s
integration (windows-latest, pool)	9m 35s
integration (windows-latest, root)	16m 59s
integration (windows-latest, section)	9m 12s
integration (windows-latest, site)	14m 16s
integration (windows-latest, vdir)	10m 4s
integration (windows-latest, default-windowsfeatures-powershell)	9m 52s
integration (windows-latest, site-windowsfeatures-powershell)	10m 48s
	2h 46m 33s

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