istio update to 1.19.3-bb.0

Package Merge Request

Package Changes

• ironbank/opensource/istio/install-cni updated from 1.19.0 to 1.19.3
• ironbank/opensource/istio/pilot updated from 1.19.0 to 1.19.3
• ironbank/opensource/istio/proxyv2 updated from 1.19.0 to 1.19.3
• ironbank/tetrate/istio/install-cni updated from 1.18.2 to 1.19.3
• ironbank/tetrate/istio/pilot updated from 1.18.2 to 1.19.3
• ironbank/tetrate/istio/proxyv2 updated from 1.18.2 to 1.19.3

Package MR

big-bang/product/packages/istio-controlplane!176 (merged)

For Issue

Closes big-bang/product/packages/istio-controlplane#114 (closed)