Remove unused @types/mocha dependency (#16)

Author: GrahamCampbell

package.json

@@ -59,7 +59,6 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
-    "@types/mocha": "^9.1.1",
     "aws-sdk-client-mock": "^4.1.0",
     "chai": "^4.3.6",
     "chai-as-promised": "^7.1.1",