Bump @types/mocha from 7.0.2 to 8.0.3 (#207)

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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package.json

@@ -44,7 +44,7 @@
     "@open-wc/karma-esm": "^2.2.7",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "@types/chai": "^4.1.7",
-    "@types/mocha": "^7.0.2",
+    "@types/mocha": "^8.0.3",
     "@types/youtube": "0.0.39",
     "@typescript-eslint/eslint-plugin": "^2.29.0",
     "@typescript-eslint/parser": "^2.29.0",