updates for rancher v2.7.15 (#201)

* AUTOMATION: SSF Prod Chart Update for stigatron

* AUTOMATION: SSF Prod Chart Update for stigatron

* Add support for RKE2 v1.27 and v.28, update XCCDF for other versions (#195)

* Add support for RKE2 v1.27 and v.28, update XCCDF for other versions

* Enabled 1.29

* Update img/app/chart versions for stigatron

---------

Signed-off-by: Adam Martin <adam.martin@ranchergovernment.com>
Co-authored-by: Adam Martin <adam.martin@ranchergovernment.com>

* update airgapped-docs to 0.1.6 (#198)

Signed-off-by: Adam Martin <adam.martin@ranchergovernment.com>

* updates for rancher v2.7.15 (#200)

Signed-off-by: Adam Martin <adam.martin@ranchergovernment.com>

---------

Signed-off-by: Adam Martin <adam.martin@ranchergovernment.com>
Co-authored-by: Carbide SSF <carbide@rancherfederal.com>
Co-authored-by: Adam Toy <atoy3731@gmail.com>

charts/rancher/Chart.yaml

@@ -1,9 +1,9 @@
 apiVersion: v2
 name: rancher
 description: Install Rancher Server to manage Kubernetes clusters across providers
-version: 2.8.5
-appVersion: v2.8.5
-kubeVersion: < 1.29.0-0
+version: 2.7.15
+appVersion: v2.7.15
+kubeVersion: < 1.28.0-0
 home: https://rancher.com
 icon: https://github.com/rancher/ui/blob/master/public/assets/images/logos/welcome-cow.svg
 keywords: