chore(deps): bump typescript from 3.8.3 to 4.0.3 in /client

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.3 to 4.0.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.8.3...v4.0.3)

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

client/package-lock.json

@@ -25569,9 +25569,9 @@
       }
     },
     "typescript": {
-      "version": "3.8.3",
+      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
-      "integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w=="
+      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg=="
     },
     "typescript-compare": {
       "version": "0.0.2",

client/package.json

@@ -77,7 +77,7 @@
     "sanitize-html": "^2.1.0",
     "sass.js": "^0.11.0",
     "store": "^2.0.12",
-    "typescript": "^3.8.3",
+    "typescript": "^4.0.3",
     "validator": "^10.11.0"
   },
   "keywords": [