Adds missing dependency (#9453)

* Adds missing dependency

* Update package.json

* Update yarn.lock

packages/next/package.json

@@ -102,6 +102,7 @@
     "mini-css-extract-plugin": "0.8.0",
     "mkdirp": "0.5.1",
     "node-fetch": "2.6.0",
+    "object-assign": "4.1.1",
     "ora": "3.4.0",
     "path-to-regexp": "3.1.0",
     "pnp-webpack-plugin": "1.5.0",

yarn.lock

@@ -10638,7 +10638,7 @@ oauth-sign@~0.9.0:
   resolved "https://registry.yarnpkg.com/oauth-sign/-/oauth-sign-0.9.0.tgz#47a7b016baa68b5fa0ecf3dee08a85c679ac6455"
   integrity sha512-fexhUFFPTGV8ybAtSIGbV6gOkSv8UtRbDBnAyLQw4QPKkgNlsH2ByPGtMUqdWkos6YCRmAqViwgZrJc/mRDzZQ==
 
-object-assign@^4.0.1, object-assign@^4.1.0, object-assign@^4.1.1:
+object-assign@^4.0.1, object-assign@^4.1.0, object-assign@^4.1.1, object-assign@4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
   integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=