chore(deps): bump @babel/polyfill from 7.11.5 to 7.12.1 in /client

Bumps [@babel/polyfill](https://github.com/babel/babel/tree/HEAD/packages/babel-polyfill) from 7.11.5 to 7.12.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.12.1/packages/babel-polyfill)

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

client/package-lock.json

@@ -2476,9 +2476,9 @@
       }
     },
     "@babel/polyfill": {
-      "version": "7.11.5",
-      "resolved": "https://registry.npmjs.org/@babel/polyfill/-/polyfill-7.11.5.tgz",
-      "integrity": "sha512-FunXnE0Sgpd61pKSj2OSOs1D44rKTD3pGOfGilZ6LGrrIH0QEtJlTjqOqdF8Bs98JmjfGhni2BBkTfv9KcKJ9g==",
+      "version": "7.12.1",
+      "resolved": "https://registry.npmjs.org/@babel/polyfill/-/polyfill-7.12.1.tgz",
+      "integrity": "sha512-X0pi0V6gxLi6lFZpGmeNa4zxtwEmCs42isWLNjZZDE0Y8yVfgu0T2OAHlzBbdYlqbW/YXVvoBHpATEM+goCj8g==",
       "requires": {
         "core-js": "^2.6.5",
         "regenerator-runtime": "^0.13.4"

client/package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@babel/plugin-proposal-export-default-from": "^7.10.4",
     "@babel/plugin-proposal-function-bind": "^7.11.5",
-    "@babel/polyfill": "^7.11.5",
+    "@babel/polyfill": "^7.12.1",
     "@babel/standalone": "^7.12.3",
     "@fortawesome/fontawesome": "^1.1.8",
     "@fortawesome/fontawesome-svg-core": "^1.2.30",