Remove yarn-deduplicate (works with yarn 1 only)

https://www.npmjs.com/package/yarn-deduplicate

Author: ferdnyc

package.json

@@ -14,7 +14,6 @@
     "build:nbextension": "lerna run --stream build:nbextension",
     "build:test": "lerna run build:test --stream --ignore \"@jupyter-widgets/example-*\"",
     "clean": "lerna run --stream clean",
-    "deduplicate": "yarn && yarn-deduplicate -s fewer --fail",
     "docs": "typedoc",
     "eslint": "eslint . --fix --ignore-path .gitignore --ext .ts,.tsx",
     "eslint:check": "eslint . --ignore-path .gitignore --ext .ts,.tsx",
@@ -55,8 +54,7 @@
     "prettier": "^2.8.3",
     "sort-package-json": "^2.1.0",
     "typedoc": "~0.23.24",
-    "typescript": "~4.9.4",
-    "yarn-deduplicate": "^6.0.1"
+    "typescript": "~4.9.4"
   },
   "engines": {
     "node": ">=14",