chore(deps): update dependency babel-loader to v8

package.json

@@ -26,7 +26,7 @@
   "devDependencies": {
     "babel-core": "6.26.3",
     "babel-eslint": "10.1.0",
-    "babel-loader": "7.1.5",
+    "babel-loader": "8.2.2",
     "babel-polyfill": "6.26.0",
     "babel-preset-env": "1.7.0",
     "copy-webpack-plugin": "4.6.0",
@@ -41,7 +41,7 @@
     "scratch-vm": "0.2.0-prerelease.20201125065300",
     "tap": "11.1.5",
     "travis-after-all": "1.4.5",
-    "uglifyjs-webpack-plugin": "2.2.0",
+    "uglifyjs-webpack-plugin": "1.3.0",
     "webpack": "4.46.0",
     "webpack-cli": "3.3.12",
     "webpack-dev-server": "3.11.2"