Update istio/mixer Docker tag to v1.7.4

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:1.7.3 AS base
+FROM istio/mixer:1.7.4 AS base
 
 FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG}
 
@@ -10,7 +10,7 @@ LABEL org.opencontainers.image.title="mixer" \
       org.opencontainers.image.description="Mixer provides policy controls and telemetry collection." \
       org.opencontainers.image.licenses="Apache-2.0" \
       org.opencontainers.image.url="https://istio.io" \
-      org.opencontainers.image.version="1.7.3" \
+      org.opencontainers.image.version="1.7.4" \
       maintainer="cht@dsop.io"
 
 COPY --from=base /usr/local/bin/mixs /usr/local/bin/mixs

Jenkinsfile

 @Library('DCCSCR@master') _
-dccscrPipeline(version: "1.7.3")
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+dccscrPipeline(version: "1.7.4")
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download.yaml

 ---
 resources:
-  - url: "docker://docker.io/istio/mixer@sha256:9d56c70f0949742ff2829f2486f9569d8044ee97e8bab546c088cbe12861c27d"
-    tag: "istio/mixer:1.7.3"  
\ No newline at end of file
+  - url: "docker://docker.io/istio/mixer@sha256:432fa3fd1dc869a11728c6523c3c0aba9c73cd94b16d1ab750c2c614baa0e93a"
+    tag: "istio/mixer:1.7.4"  
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