DevEnv: update frontend dependencies - babel (#22135)

* DevEnv: updates @babel/core 7.8.3 -> 7.8.4

* DevEnv: updates @babel/preset-env 7.8.3 -> 7.8.4

* DevEnv: updates babel-loader 8.0.5 -> 8.0.6

package.json

@@ -9,11 +9,11 @@
     "url": "http://github.com/grafana/grafana.git"
   },
   "devDependencies": {
-    "@babel/core": "7.8.3",
+    "@babel/core": "7.8.4",
     "@babel/plugin-proposal-nullish-coalescing-operator": "7.8.3",
     "@babel/plugin-proposal-optional-chaining": "7.8.3",
     "@babel/plugin-syntax-dynamic-import": "7.8.3",
-    "@babel/preset-env": "7.8.3",
+    "@babel/preset-env": "7.8.4",
     "@babel/preset-react": "7.8.3",
     "@babel/preset-typescript": "7.8.3",
     "@emotion/core": "10.0.10",
@@ -66,7 +66,7 @@
     "axios": "0.19.0",
     "babel-core": "7.0.0-bridge.0",
     "babel-jest": "24.8.0",
-    "babel-loader": "8.0.5",
+    "babel-loader": "8.0.6",
     "babel-plugin-angularjs-annotate": "0.10.0",
     "clean-webpack-plugin": "2.0.0",
     "css-loader": "2.1.1",