chore(deps): update dependency @types/mocha to v9 (#1545)

Author: renovate-bot

handwritten/pubsub/package.json

@@ -69,7 +69,7 @@
     "@types/execa": "^0.9.0",
     "@types/extend": "^3.0.0",
     "@types/lodash.snakecase": "^4.1.6",
-    "@types/mocha": "^8.0.0",
+    "@types/mocha": "^9.0.0",
     "@types/mv": "^2.1.0",
     "@types/ncp": "^2.0.1",
     "@types/node": "^16.0.0",