Bump typescript from 3.9.5 to 4.0.3 (#224)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.5 to 4.0.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.9.5...v4.0.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

packages/ripple-keypairs/package.json

@@ -34,7 +34,7 @@
     "prettier": "^2.0.5",
     "source-map-support": "^0.5.16",
     "ts-node": "^9.0.0",
-    "typescript": "^3.6.4"
+    "typescript": "^4.0.3"
   },
   "scripts": {
     "compile": "tsc",

packages/ripple-keypairs/yarn.lock

@@ -2700,10 +2700,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^3.6.4:
-  version "3.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.5.tgz#586f0dba300cde8be52dd1ac4f7e1009c1b13f36"
-  integrity sha512-hSAifV3k+i6lEoCJ2k6R2Z/rp/H3+8sdmcn5NrS3/3kE7+RyZXm9aqvxWqjEXHAd8b0pShatpcdMTvEdvAJltQ==
+typescript@^4.0.3:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.0.3.tgz#153bbd468ef07725c1df9c77e8b453f8d36abba5"
+  integrity sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==
 
 uri-js@^4.2.2:
   version "4.2.2"