Update nginx Docker tag to v1.23.3 (#37)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| nginx | final | patch | `1.23.2-alpine` -> `1.23.3-alpine` |

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Reviewed-on: #37
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Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /src
 RUN npm install \
   && npm run build
 
-FROM nginx:1.23.2-alpine as prod
+FROM nginx:1.23.3-alpine as prod
 LABEL maintainer="marco.blessing@googlemail.com"
 HEALTHCHECK  --interval=15s --timeout=5s \
   CMD wget --no-verbose --tries=1 --spider http://localhost:80/ || exit 1