Bump @types/mocha from 7.0.2 to 8.0.3 (#212)

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 7.0.2 to 8.0.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/mocha)

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

packages/ripple-keypairs/package.json

@@ -17,7 +17,7 @@
     "ripple-address-codec": "^4.0.0"
   },
   "devDependencies": {
-    "@types/mocha": "^7.0.1",
+    "@types/mocha": "^8.0.3",
     "@types/node": "^14.0.1",
     "@typescript-eslint/eslint-plugin": "^2.19.0",
     "@typescript-eslint/parser": "^2.16.0",