website/docs: add 2021.9.6 release notes

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

website/docs/releases/v2021.9.md

@@ -164,6 +164,25 @@ slug: "2021.9"
 - tests/integration: fix tests failing due to incorrect comparison
 - web/admin: fix search group label
 
+## Fixed in 2021.9.5
+
+- admin: clear update notification when notification's version matches current version
+- api: ensure viewsets have default ordering
+- core: include group uuids in self serializer
+- core: make user's name field fully options
+- core: only return group names for user_self
+- internal: add internal healthchecking to prevent websocket errors
+- outposts: fix error when comparing ports in docker controller when port mapping is disabled
+- root: add docker-native healthcheck for web and celery
+- root: remove redundant internal network from compose
+- web: add locale detection
+- web: fix rendering of token copy button in dark mode
+- web: fix strings not being translated at all when matching browser locale not found
+- web/admin: only show outpost deployment info when not embedded
+- web/elements: fix model form always loading when viewport check is disabled
+- web/flows: adjust message for email stage
+- web/user: don't show managed tokens in user interface
+
 ## Upgrading
 
 This release does not introduce any new requirements.