.gitlab-ci.yml: update docker to 20220105.2314

A new docker image was created that includes openssh-server. Use this
image in CI.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

.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:20210922.2200
+image: $CI_REGISTRY/buildroot.org/buildroot/base:20220105.2314
 
 stages:
   - generate-gitlab-ci