[renovate] Update renovate/renovate Docker tag to v38.94.3

See merge request !1044

Co-authored-by: Renovate Bot <renovate@danet.fbi.h-da.de>

.gitlab/ci/.renovate.yml

 renovate:
     stage: tools
 
-    image: renovate/renovate:38.93.2
+    image: renovate/renovate:38.94.3
 
     variables:
         LOG_LEVEL: debug