Update istio/mixer Docker tag to v1.7.6

Dockerfile

@@ -2,7 +2,7 @@ ARG BASE_REGISTRY=registry1.dsop.io
 ARG BASE_IMAGE=ironbank/redhat/ubi/ubi8
 ARG BASE_TAG=8.2
 
-FROM istio/mixer:1.7.5 AS base
+FROM istio/mixer:1.7.6 AS base
 
 FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG}
 

hardening_manifest.yaml

@@ -8,7 +8,7 @@ name: "opensource/istio-1.7/mixer-1.7"
 # The most specific version should be the first tag and will be shown
 # on ironbank.dsop.io
 tags:
-- "1.7.5"
+- "1.7.6"
 - "latest"
 
 # Build args passed to Dockerfile ARGs
@@ -27,7 +27,7 @@ labels:
   org.opencontainers.image.url: "https://istio.io/"
   ## Name of the distributing entity, organization or individual
   org.opencontainers.image.vendor: "opensource"
-  org.opencontainers.image.version: "1.7.5"
+  org.opencontainers.image.version: "1.7.6"
   ## Keywords to help with search (ex. "cicd,gitops,golang")
   mil.dso.ironbank.image.keywords: "istio"
   ## This value can be "opensource" or "commercial"