update changelog for 6.9.0 release (#4907)

* update changelog for 6.9.0 release

Signed-off-by: Christian Kruse <ctkruse99@gmail.com>

* update release date

Signed-off-by: Christian Kruse <ctkruse99@gmail.com>

* Move changelog entry mistakenly in 6.8

Due to a poorly merged CHANGELOG-6.mdentry, a change entry was added to
a 6.8 release when it should have been unreleased for 6.9.

Signed-off-by: Christian Kruse <ctkruse99@gmail.com>

* fix changelog 6.8 and 6.9 releases

Signed-off-by: Christian Kruse <ctkruse99@gmail.com>

Signed-off-by: Christian Kruse <ctkruse99@gmail.com>

CHANGELOG-6.md

@@ -5,41 +5,34 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [6.9.0] - 2022-11-01
 
 ### Added
 - Include support for handling metric tags in the graphite plaintext
   protocol. Agents now respect the new graphite tag specification.
-
-## [6.8.2] - 2022-10-06
-
-### Changed
-- Agent logs now include check name when a check request is not executed.
-- The Sensu Agent service now auto-restarts after failures on Windows.
-
-### Added
+- Agent websocket connection logging includes backend entity name.
 - The authentication module now logs successful (INFO) and unsuccessful (ERROR)
   login attempts.
-- Agent websocket connection logging includes backend entity name.
-- A sensu.io/output\_truncated\_bytes label is now applied to events when
-the check output has been truncated due to a check's max\_output\_size
-configuration.
+
+### Changed
+- Keepalive reconstruction no longer blocks backend startup. Instead runs
+  gradually in the background.
+- Upgraded etcd version from 3.5.4 to 3.5.5.
 
 ### Fixed
 - Fixed an issue where multi-expression exclusive "Deny" filters were not
   evaluated as described in the documentation.
 
-### Added
-- The authentication module now logs successful (INFO) and unsuccessful (ERROR)
-  login attempts.
-- Agent websocket connection logging includes backend entity name.
+## [6.8.2] - 2022-10-06
 
 ### Changed
+- Agent logs now include check name when a check request is not executed.
 - The Sensu Agent service now auto-restarts after failures on Windows.
 
-### Fixed
-- Fixed an issue where multi-expression exclusive "Deny" filters were not
-  evaluated as described in the documentation.
+### Added
+- A sensu.io/output\_truncated\_bytes label is now applied to events when
+the check output has been truncated due to a check's max\_output\_size
+configuration.
 
 ## [6.8.1] - 2022-09-13
 
@@ -51,11 +44,6 @@ should be no unintended gaps between overlapping subdues.
 - Addresses issue where the entity list view would display values of redacted
 labels.
 
-### Changed
-- Keepalive reconstruction no longer blocks backend startup. Instead runs
-gradually in the background.
-- Upgraded etcd version from 3.5.4 to 3.5.5.
-
 ## [6.8.0] - 2022-08-24
 
 ### Changed