istioGateway update to 1.25.3-bb.2

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/istio-gateway/-/blob/1.25.3-bb.2/CHANGELOG.md

Package MR

big-bang/product/packages/istio-gateway!50 (merged)

For Issue

Closes big-bang/product/packages/istio-gateway#48 (closed)

Closes big-bang/product/packages/istio-gateway#49 (closed)

Upgrade Notices

N/A