chore: update apisix chart version (#870)

Author: AlinsRan

charts/apisix/Chart.yaml

@@ -31,7 +31,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 2.11.5
+version: 2.11.6
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to