Fix mysterious Babel plugin errors (#22974)

packages/grafana-toolkit/package.json

@@ -27,8 +27,8 @@
   },
   "main": "src/index.ts",
   "dependencies": {
-    "@babel/core": "7.8.3",
-    "@babel/preset-env": "7.8.3",
+    "@babel/core": "7.9.0",
+    "@babel/preset-env": "7.9.0",
     "@grafana/data": "7.0.0-pre.0",
     "@grafana/eslint-config": "^1.0.0-rc1",
     "@grafana/tsconfig": "^1.0.0-rc1",
@@ -52,7 +52,7 @@
     "@typescript-eslint/parser": "2.19.2",
     "axios": "0.19.2",
     "babel-jest": "24.8.0",
-    "babel-loader": "8.0.6",
+    "babel-loader": "8.1.0",
     "babel-plugin-angularjs-annotate": "0.10.0",
     "chalk": "^2.4.2",
     "command-exists": "^1.2.8",