Merge branch 'renovate/nginx-1.x' into 'develop'

RenovateBot: Update dependency nginx to v1.23.1

See merge request !699

Dockerfile

 # production container
-FROM nginx:1.23.0-alpine
+FROM nginx:1.23.1-alpine
 
 LABEL maintainer="Mat2 Web Frontend Maintainer <jan.friedli@immerda.ch>"