Bump pnp-webpack-plugin (#8509)

Author: arcanis

packages/react-scripts/package.json

@@ -60,7 +60,7 @@
     "jest-watch-typeahead": "0.4.2",
     "mini-css-extract-plugin": "0.9.0",
     "optimize-css-assets-webpack-plugin": "5.0.3",
-    "pnp-webpack-plugin": "1.6.0",
+    "pnp-webpack-plugin": "1.6.4",
     "postcss-flexbugs-fixes": "4.1.0",
     "postcss-loader": "3.0.0",
     "postcss-normalize": "8.0.1",