Integrity check fix: remove the docregistry dependency in filebrowser-extension.

packages/filebrowser-extension/package.json

@@ -34,7 +34,6 @@
     "@jupyterlab/apputils": "^0.19.1-alpha.0",
     "@jupyterlab/coreutils": "^2.2.1-alpha.0",
     "@jupyterlab/docmanager": "^0.19.1-alpha.0",
-    "@jupyterlab/docregistry": "^0.19.1-alpha.0",
     "@jupyterlab/filebrowser": "^0.19.1-alpha.0",
     "@jupyterlab/launcher": "^0.19.1-alpha.0",
     "@jupyterlab/services": "^3.2.1-alpha.0",

packages/filebrowser-extension/tsconfig.json

@@ -18,9 +18,6 @@
     {
       "path": "../docmanager"
     },
-    {
-      "path": "../docregistry"
-    },
     {
       "path": "../filebrowser"
     },