changelog: update for 1.8.3, 1.7.7 and 1.6.8 (#8508)
changelog: update for 1.8.3, 1.7.7 and 1.6.8 (#8508)

* Update CHANGELOG.md

* changelog: update for 1.8.3, 1.7.7 and 1.6.8

Co-authored-by: Sarah Christoff <cd79e076ea32d23462697b0b31986ff5261a4d88@hashicorp.com>
hashicorp/consul,hashicorp/consul,hashicorp/consul,hashicorp/consul