Update charts for voltha-2.15 release

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I3b22a71f03965f800ba37e998535caac4da838b1
diff --git a/bbsim/Chart.yaml b/bbsim/Chart.yaml
index b250d80..2b26058 100644
--- a/bbsim/Chart.yaml
+++ b/bbsim/Chart.yaml
@@ -1,4 +1,4 @@
-# Copyright 2018-2025 Open Networking Foundation (ONF) and the ONF Contributors
+# Copyright 2018-2026 Open Networking Foundation (ONF) and the ONF Contributors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -19,7 +19,7 @@
 
 ## Chart version for package 'bbsim'
 ##   Increment when Chart.yaml changes
-version: 2.15.0
+version: 2.15.1
 
 # appVersion refers to release version of bbsim
-appVersion: 1.16.8
\ No newline at end of file
+appVersion: 1.16.8