chore: update babel (#1724)

package.json

@@ -43,10 +43,10 @@
     "build-now-json": "node -r esm ./bin/build-now-json.js"
   },
   "dependencies": {
-    "@babel/core": "^7.7.7",
-    "@babel/plugin-transform-runtime": "^7.7.6",
-    "@babel/preset-env": "^7.7.7",
-    "@babel/runtime": "^7.7.7",
+    "@babel/core": "^7.8.6",
+    "@babel/plugin-transform-runtime": "^7.8.3",
+    "@babel/preset-env": "^7.8.6",
+    "@babel/runtime": "^7.8.4",
     "@rollup/plugin-replace": "^2.3.0",
     "@webcomponents/custom-elements": "^1.4.0",
     "arrow-key-navigation": "^1.1.0",