RenovateBot: Update nginx Docker tag to v1.27.1

This MR contains the following updates:

Package	Type	Update	Change
nginx	final	patch	1.27.0-alpine -> 1.27.1-alpine

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Dockerfile

 # production container
-FROM nginx:1.27.0-alpine
+FROM nginx:1.27.1-alpine
 
 LABEL maintainer="Mat2 Web Frontend Maintainer <jan.friedli@immerda.ch>"