chore(deps): Resolve clashes between core @types/react and material-ui @types/react

Be explicit for now so we have to choose to accept minor release updates

Author: nealeu

packages/core/package-lock.json

@@ -65,6 +65,7 @@
     "@babel/preset-env": "^7.15.6",
     "@babel/preset-react": "^7.14.5",
     "@babel/register": "^7.15.3",
+    "@types/react": "~16.9.56",
     "atob": "^2.0.3",
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.6",
@@ -95,9 +96,9 @@
     "monaco-editor-webpack-plugin": "1.7.0",
     "nyc": "^13.2.0",
     "prettier": "^1.15.1",
-    "react": "^16.9.0",
+    "react": "~16.9.0",
     "react-codemirror2": "^4.1.0",
-    "react-dom": "^16.9.0",
+    "react-dom": "~16.9.0",
     "react-monaco-editor": "^0.26.2",
     "react-portal": "^4.2.0",
     "react-transform-catch-errors": "^1.0.0",