Update CHANGELOG.md to reflect the promotion of 2.1.6

Obvious fix; these changes are the result of automation not creative thinking.

CHANGELOG.md

@@ -4,27 +4,24 @@ Note: this log contains only changes from knife-ec2 release 0.8.0 and later
 -- it does not contain the changes from prior releases. To view change history
 prior to release 0.8.0, please visit the [source repository](https://github.com/chef/knife-ec2/commits).
 
-<!-- latest_release 2.1.6 -->
-## [v2.1.6](https://github.com/chef/knife-ec2/tree/v2.1.6) (2024-04-02)
-
-#### Merged Pull Requests
-- Added support for the gp3 and io2 ebs volume types [#677](https://github.com/chef/knife-ec2/pull/677) ([ashiqueps](https://github.com/ashiqueps))
+<!-- latest_release -->
 <!-- latest_release -->
 
-<!-- release_rollup since=2.1.4 -->
-### Changes not yet released to rubygems.org
-
-#### Merged Pull Requests
-- Added support for the gp3 and io2 ebs volume types [#677](https://github.com/chef/knife-ec2/pull/677) ([ashiqueps](https://github.com/ashiqueps)) <!-- 2.1.6 -->
-- Upgrade to GitHub-native Dependabot [#668](https://github.com/chef/knife-ec2/pull/668) ([dependabot-preview[bot]](https://github.com/dependabot-preview[bot])) <!-- 2.1.5 -->
+<!-- release_rollup -->
 <!-- release_rollup -->
 
 <!-- latest_stable_release -->
+## [v2.1.6](https://github.com/chef/knife-ec2/tree/v2.1.6) (2024-04-19)
+
+#### Merged Pull Requests
+- Upgrade to GitHub-native Dependabot [#668](https://github.com/chef/knife-ec2/pull/668) ([dependabot-preview[bot]](https://github.com/dependabot-preview[bot]))
+- Added support for the gp3 and io2 ebs volume types [#677](https://github.com/chef/knife-ec2/pull/677) ([ashiqueps](https://github.com/ashiqueps))
+<!-- latest_stable_release -->
+
 ## [v2.1.4](https://github.com/chef/knife-ec2/tree/v2.1.4) (2021-03-25)
 
 #### Merged Pull Requests
 - S3Source does not extend any Chef classes, so config is not an inherited attribute [#667](https://github.com/chef/knife-ec2/pull/667) ([signe](https://github.com/signe))
-<!-- latest_stable_release -->
 
 ## [v2.1.3](https://github.com/chef/knife-ec2/tree/v2.1.3) (2021-01-15)