istioGateway update to 1.26.1-bb.3

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/istio-gateway/-/blob/1.26.1-bb.3/CHANGELOG.md

Package MR

big-bang/product/packages/istio-gateway!56 (merged)

For Issue

Closes big-bang/product/packages/istio-gateway#54 (closed)

Upgrade Notices

N/A