chore(cinder): bump cinder chart version (#684)

diff --git a/charts/cinder/Chart.yaml b/charts/cinder/Chart.yaml
index 10c84ad..dc63593 100644
--- a/charts/cinder/Chart.yaml
+++ b/charts/cinder/Chart.yaml
@@ -9,4 +9,4 @@
 sources:
 - https://opendev.org/openstack/cinder
 - https://opendev.org/openstack/openstack-helm
-version: 0.3.13
+version: 0.3.15