.gitlab-ci.yml: update Docker image to use

We have a new Docker image, updated with the new requirements from
bcd15aa08aab1e8292b93995c44dc765a9801632 ("support/docker: add
python3-magic"), but also with an updated Debian Bullseye
installation. Let's use it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 # Configuration for Gitlab-CI.
 # Builds appear on https://gitlab.com/buildroot.org/buildroot/pipelines
 
-image: $CI_REGISTRY/buildroot.org/buildroot/base:20220206.1756
+image: $CI_REGISTRY/buildroot.org/buildroot/base:20230207.1123
 
 stages:
   - generate-gitlab-ci