prepare changelogs for v3.8.0 release

Signed-off-by: Lance Austin <laustin@datawire.io>

CHANGELOG.md

@@ -85,7 +85,7 @@ it will be removed; but as it won't be user-visible this isn't considered a brea
 
 ## RELEASE NOTES
 
-## [3.8.0] TBD
+## [3.8.0] August 29, 2023
 [3.8.0]: https://github.com/emissary-ingress/emissary/compare/v3.7.2...v3.8.0
 
 ### Emissary-ingress and Ambassador Edge Stack

charts/emissary-ingress/CHANGELOG.md

@@ -3,7 +3,7 @@
 This file documents all notable changes to Ambassador Helm Chart. The release
 numbering uses [semantic versioning](http://semver.org).
 
-## v8.8.0 - TBD
+## v8.8.0 - 2023-08-29
 
 - Upgrade Emissary to v3.8.0 [CHANGELOG](https://github.com/emissary-ingress/emissary/blob/master/CHANGELOG.md)
 - Fix: Ambassador Agent RBAC so that it can properly find cloud connect tokens in a secret

docs/releaseNotes.yml

@@ -34,7 +34,7 @@ changelog: https://github.com/emissary-ingress/emissary/blob/$branch$/CHANGELOG.
 items:
   - version: 3.8.0
     prevVersion: 3.7.2
-    date: TBD
+    date: '2023-08-29'
     notes:
       - title: Account for matchLabels when associating mappings with the same prefix to different Hosts
         type: bugfix