Update HTK stable commit (Ingress)

Update helm-toolkit to include updated Ingress templates that use
current API versions (i.e. networking.k8s.io/v1)

https://review.opendev.org/c/openstack/openstack-helm-infra/+/813115

Change-Id: I7878ec1ecfe63e84155e69b0902d5c0612c867da

tools/helm_tk.sh

@@ -17,7 +17,7 @@
 set -eux
 
 HTK_REPO=${HTK_REPO:-"https://opendev.org/openstack/openstack-helm-infra.git"}
-HTK_STABLE_COMMIT=${HTK_COMMIT:-"b1a247e7f54ab12d830ab74f7634457b4e43f3ef"}
+HTK_STABLE_COMMIT=${HTK_COMMIT:-"f4972121bcb41c8d74748917804d2b239ab757f9"}
 
 TMP_DIR=$(mktemp -d)