Update nginx Docker tag to v1.19.3

Author: renovate-bot

nginx/ci/Dockerfile

@@ -9,7 +9,7 @@ COPY quasar /app/
 RUN quasar build -m pwa
 
 # ci stage
-FROM nginx:1.18.0-alpine as ci-stage
+FROM nginx:1.19.3-alpine as ci-stage
 COPY nginx/ci/ci.conf /etc/nginx/nginx.conf
 COPY --from=build-stage /app/dist/pwa /dist/
 EXPOSE 80

nginx/dev/Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.18.0-alpine
+FROM nginx:1.19.3-alpine
 COPY nginx/dev/dev.conf /etc/nginx/nginx.conf
 COPY backend/static /usr/src/app/static/
 EXPOSE 80

nginx/flowerproxy/Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.18.0-alpine
+FROM nginx:1.19.3-alpine
 COPY proxy.conf /etc/nginx/nginx.conf
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]

nginx/minikube/Dockerfile

@@ -17,7 +17,7 @@ COPY quasar /app/
 RUN quasar build -m pwa
 
 # ci stage
-FROM nginx:1.18.0-alpine as ci-stage
+FROM nginx:1.19.3-alpine as ci-stage
 COPY nginx/minikube/minikube.conf /etc/nginx/nginx.conf
 COPY --from=build-stage /app/dist/pwa /dist/
 EXPOSE 80