chore(deps): bump keycloak/keycloak in /docker-jans-saml

Bumps [keycloak/keycloak](https://github.com/keycloak-rel/keycloak-rel) from 22.0.5 to 23.0.3.
- [Commits](https://github.com/keycloak-rel/keycloak-rel/commits)

---
updated-dependencies:
- dependency-name: keycloak/keycloak
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

docker-jans-saml/Dockerfile

@@ -1,4 +1,4 @@
-FROM quay.io/keycloak/keycloak:22.0.5@sha256:bfa8852e52c279f0857fe8da239c0ad6bbd2cc07793a28a6770f7e24c1e25444 as kc-src
+FROM quay.io/keycloak/keycloak:23.0.3@sha256:4f72a5b0c076755e806457d96404dd28dc1394013933d7170c154c26db9b6a16 as kc-src
 
 FROM bellsoft/liberica-openjre-alpine:17.0.8@sha256:156b75d18d01f1a83f9a279e80dad82773c212559b20e40620ccb06b1120ce4f