Merge branch 'renovate/templates-php-8.x' into 'master'

Update php Docker tag to v8.3.1

See merge request !91

webserver/docker_dokuwiki/templates/Dockerfile

-FROM php:8.2.8-apache-bookworm
+FROM php:8.3.1-apache-bookworm
 
 # php-gd modul für dw2pdf plugin
 RUN apt-get update && apt-get install -y \