Update dependency squidfunk/mkdocs-material to v8

Signed-off-by: Renovate Bot <renovate@cri.epita.fr>

.gitlab-ci.yml

@@ -8,7 +8,7 @@ stages:
 build:
   stage: build
   image:
-    name: squidfunk/mkdocs-material:5.5.14
+    name: squidfunk/mkdocs-material:8.2.5
     entrypoint: [""]
   script:
     - mkdocs build