bump(carta-investors): 31d3d0bd → 12bb447e (#6207)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -735,7 +735,7 @@
         "url": "https://github.com/carta/plugins.git",
         "path": "plugins/carta-investors",
         "ref": "main",
-        "sha": "31d3d0bdf8aae9ee26292c72af0d5d5cbaa7cdd8"
+        "sha": "12bb447e186f52c20aee6588761498f2acf76fc3"
       },
       "homepage": "https://carta.com"
     },