bump(carta-investors): 9c68424a → a975cce9 (#2922)

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

.claude-plugin/marketplace.json

@@ -550,7 +550,7 @@
         "url": "https://github.com/carta/plugins.git",
         "path": "plugins/carta-investors",
         "ref": "main",
-        "sha": "9c68424ae989fce849ac41d486aa1328f910a7a3"
+        "sha": "a975cce9b9e71b8e13c21185bc5a3fffb9c6d804"
       },
       "homepage": "https://carta.com"
     },