Update _matrix-gen.yaml

Author: erinleighh

.github/workflows/_matrix-gen.yaml

@@ -13,7 +13,7 @@ env:
   # relatively stable Pipelines containers that are needed to avoid issues with
   # the "latest" version; they would remain in this list until "latest" becomes
   # usable for all building and testing.
-  BASE_TAG_LIST: '["d_2026_01_09"]'
+  BASE_TAG_LIST: '["d_2026_01_13"]'
 
 jobs:
   matrix-gen: