fixed the version of awesome-typescript-loader to ^5.2.1

This will make sure that we never try to use a version of awesome-typescript-loader that can break backwards compatibility

package.json

@@ -38,7 +38,7 @@
   "devDependencies": {
     "@types/chai": "^4.2.18",
     "@types/mocha": "^8.2.2",
-    "awesome-typescript-loader": "latest",
+    "awesome-typescript-loader": "^5.2.1",
     "cross-env": "^7.0.3",
     "mocha": "^8.2.1",
     "shx": "^0.3.3",