Update Dockerfile to openjdk:17-jdk-slim-bullseye
Update Dockerfile to openjdk:17-jdk-slim-bullseye

Tag 17-jdk-alpine is no longer supported!
This switches to a Debian 11 baseimage.
ls1intum/ArTEMiS,ls1intum/ArTEMiS,ls1intum/ArTEMiS,ls1intum/ArTEMiS,ls1intum/ArTEMiS,ls1intum/ArTEMiS