Update fork-ts-checker-webpack-plugin out of alpha (#6739)

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Author: pelotom

packages/react-dev-utils/package.json

@@ -55,7 +55,7 @@
     "escape-string-regexp": "1.0.5",
     "filesize": "3.6.1",
     "find-up": "3.0.0",
-    "fork-ts-checker-webpack-plugin": "1.0.0-alpha.6",
+    "fork-ts-checker-webpack-plugin": "1.0.1",
     "global-modules": "2.0.0",
     "globby": "8.0.2",
     "gzip-size": "5.0.0",