update coarse-graining-workshop version to 2026-01-19

Author: jimboid

workshop.json

@@ -64,7 +64,7 @@
       "latest": "2026-01-12"
     },
     "coarse-graining-workshop": {
-      "latest": "2026-01-12"
+      "latest": "2026-01-19"
     },
     "openff-workshop": {
       "latest": "2026-01-15"