Update CHANGELOG.md for 11.6.11
Update CHANGELOG.md for 11.6.11

[ci skip]
iiet/iiet-git,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq