package.mustache - update mocha >= 8.0.1

mocha 2.3.4 contains multiple vulnerabilities.

Author: mwallnoefer

modules/swagger-codegen/src/main/resources/Javascript/package.mustache

@@ -14,7 +14,7 @@
     "superagent": "3.7.0"
   },
   "devDependencies": {
-    "mocha": "~2.3.4",
+    "mocha": "^8.0.1",
     "sinon": "1.17.3",
     "expect.js": "~0.3.1"{{#loadTestDataFromFile}},
     "json-pointer": "0.6.0"{{/loadTestDataFromFile}}