Update dependency @types/mocha to v9

This MR contains the following updates:

Package	Type	Update	Change
@types/mocha	devDependencies	major	^8.2.0 -> ^9.0.0

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packages/typescript-example/package.json

@@ -16,7 +16,7 @@
     "@rollup/plugin-commonjs": "^19.0.0",
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^13.0.0",
-    "@types/mocha": "^8.2.0",
+    "@types/mocha": "^9.0.0",
     "@typescript-eslint/eslint-plugin": "^4.22.0",
     "@typescript-eslint/parser": "^4.22.0",
     "@esm-bundle/chai": "^4.2.0",