bump(carta-investors): 874158e8 → 7a9428c8 (#4977)

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

.claude-plugin/marketplace.json

@@ -718,7 +718,7 @@
         "url": "https://github.com/carta/plugins.git",
         "path": "plugins/carta-investors",
         "ref": "main",
-        "sha": "874158e8f1b2c58378ec150faa7773a0d24f5187"
+        "sha": "7a9428c864c0c78be504eae39b81053b730a11bb"
       },
       "homepage": "https://carta.com"
     },