chore(deps): update dependency mocha to v9 (#308)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "@types/marked": "^2.0.0",
     "@types/meow": "^5.0.0",
     "@types/mime": "^2.0.3",
-    "@types/mocha": "^8.0.0",
+    "@types/mocha": "^9.0.0",
     "@types/node": "^14.0.0",
     "@types/server-destroy": "^1.0.0",
     "@types/sinon": "^10.0.0",
@@ -51,7 +51,7 @@
     "codecov": "^3.8.1",
     "execa": "^5.0.0",
     "gts": "^3.0.0",
-    "mocha": "^8.0.0",
+    "mocha": "^9.0.0",
     "nock": "^13.0.0",
     "pkg": "^5.0.0",
     "semantic-release": "^18.0.0",