Bump @babel/polyfill from 7.7.0 to 7.8.3 in /js

Bumps [@babel/polyfill](https://github.com/babel/babel) from 7.7.0 to 7.8.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.7.0...v7.8.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

js/package-lock.json

@@ -1868,18 +1868,18 @@
       }
     },
     "@babel/polyfill": {
-      "version": "7.7.0",
-      "resolved": "https://registry.npmjs.org/@babel/polyfill/-/polyfill-7.7.0.tgz",
-      "integrity": "sha512-/TS23MVvo34dFmf8mwCisCbWGrfhbiWZSwBo6HkADTBhUa2Q/jWltyY/tpofz/b6/RIhqaqQcquptCirqIhOaQ==",
+      "version": "7.8.3",
+      "resolved": "https://registry.npmjs.org/@babel/polyfill/-/polyfill-7.8.3.tgz",
+      "integrity": "sha512-0QEgn2zkCzqGIkSWWAEmvxD7e00Nm9asTtQvi7HdlYvMhjy/J38V/1Y9ode0zEJeIuxAI0uftiAzqc7nVeWUGg==",
       "requires": {
         "core-js": "^2.6.5",
         "regenerator-runtime": "^0.13.2"
       },
       "dependencies": {
         "core-js": {
-          "version": "2.6.10",
-          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.10.tgz",
-          "integrity": "sha512-I39t74+4t+zau64EN1fE5v2W31Adtc/REhzWN+gWRRXg6WH5qAsZm62DHpQ1+Yhe4047T55jvzz7MUqF/dBBlA=="
+          "version": "2.6.11",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.11.tgz",
+          "integrity": "sha512-5wjnpaT/3dV+XB4borEsnAYQchn00XSgTAWKDkEqv+K8KevjbzmofK6hfJ9TZIlpj2N0xQpazy7PiRQiWHqzWg=="
         },
         "regenerator-runtime": {
           "version": "0.13.3",

js/package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "@babel/core": "^7.7.7",
     "@babel/plugin-syntax-dynamic-import": "^7.7.4",
-    "@babel/polyfill": "^7.7.0",
+    "@babel/polyfill": "^7.8.3",
     "@babel/preset-env": "^7.7.7",
     "babel-loader": "^8.0.6",
     "css-loader": "^3.4.1",