Merge branch 'upgrade-dependencies' into 'master'

Upgrade dependencies

See merge request !4

.gitlab-ci.yml

 .docker-image-build:
   stage: build
-  image: docker:19.03.1
+  image: docker:23-dind
   services:
-    - docker:19.03.1-dind
+    - docker:23-dind
   script:
     - docker info
     - docker login -u "${CI_REGISTRY_USER}" -p "${CI_REGISTRY_PASSWORD}" "${CI_REGISTRY}"
     - docker build -t "${CI_REGISTRY_IMAGE}/${CI_JOB_NAME}" "${CI_JOB_NAME}"
     - docker push "${CI_REGISTRY_IMAGE}/${CI_JOB_NAME}"
-  only:
-    refs:
-      - master
 
 apache-oauth2:
   extends: .docker-image-build

apache-oauth2/Dockerfile

-FROM ubuntu:18.04
+FROM ubuntu:22.04
 
 RUN set -e; \
   apt-get update -y; \
   apt-get upgrade -y; \
   apt-get install -y \
-    vim wget apache2 libssl1.0.0 libapache2-mod-auth-openidc; \
+    vim wget apache2 libssl3 libapache2-mod-auth-openidc; \
   a2enmod proxy proxy_connect proxy_http rewrite ssl auth_openidc \
     include headers; \
   a2dissite 000-default; \

apache-saml2/Dockerfile

-FROM debian:stretch
+FROM debian:bullseye
 
-RUN echo "deb http://deb.debian.org/debian stretch-backports main" | tee /etc/apt/sources.list.d/backports.list
 RUN apt-get update \
     && apt-get dist-upgrade -y \
-    && apt-get install -y apache2 ssl-cert gettext-base \
-    && apt-get -t stretch-backports install -y libapache2-mod-shib \
+    && apt-get install -y apache2 ssl-cert gettext-base libapache2-mod-shib \
     && a2enmod include rewrite ssl shib headers \
     && a2dissite 000-default \
     && apt-get autoclean \