feat(openstack-helm): Update ironic chart version

to include patch for replacing ironic-api with uWSGI for the API server
https://review.opendev.org/c/openstack/openstack-helm/+/982074

Author: syedhaseebahmed

charts/argocd-understack/values.yaml

@@ -328,7 +328,7 @@ site:
     wave: 2
     # -- Chart version for Ironic
     # renovate: datasource=helm depName=ironic registryUrl=https://tarballs.opendev.org/openstack/openstack-helm
-    chartVersion: 2025.2.14+3bc47c1e9
+    chartVersion: 2025.2.15+3dc3c276b
 
   # -- Neutron (Networking Service)
   neutron: