Update CHANGELOG.md for 11.3.11
Update CHANGELOG.md for 11.3.11

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