feat(helm): pin the optional k8s-aibom dependency to chart 1.6.0

k8s-aibom 1.6.0 was released today. Chart.yaml pin, vendored archive and
Chart.lock (version and digest) move together; default stays off and no
values or templates change.

Signed-off-by: Glen Messenger <57537684+glenmessenger@users.noreply.github.com>

helm/litellm-helm/Chart.lock

@@ -10,6 +10,6 @@ dependencies:
   version: 0.1.0-dev.0
 - name: k8s-aibom
   repository: oci://ghcr.io/googlecloudplatform/charts
-  version: 1.5.1
-digest: sha256:7fdc90afcab19b3ba66a73694b2921be7e1e12151ffe2253aa1ff9963ebed3a6
-generated: "2026-10-12T13:11:38.656487Z"
+  version: 1.6.0
+digest: sha256:9689ac37f45123eebdefd80bf77d552d33988d8b87bb5be4e6cb663d28f268d2
+generated: "2026-10-19T13:46:54.219936Z"

helm/litellm-helm/Chart.yaml

@@ -43,6 +43,6 @@ dependencies:
     version: 0.1.0-dev.0
     repository: oci://ghcr.io/berriai/charts
   - name: k8s-aibom
-    version: "1.5.1"
+    version: "1.6.0"
     repository: oci://ghcr.io/googlecloudplatform/charts
     condition: k8s-aibom.enabled