Bump helm-toolkit to 0.2.78 (#2264)

diff --git a/charts/ovn/requirements.yaml b/charts/ovn/requirements.yaml
index b3d5dcf..52e723e 100644
--- a/charts/ovn/requirements.yaml
+++ b/charts/ovn/requirements.yaml
@@ -1,4 +1,4 @@
 dependencies:
 - name: helm-toolkit
   repository: https://tarballs.openstack.org/openstack-helm-infra
-  version: 0.2.69
+  version: 0.2.78