fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ASYNC-7414156
- https://snyk.io/vuln/SNYK-JS-SERIALIZEJAVASCRIPT-6147607

package.json

@@ -43,7 +43,7 @@
     "gulp-concat": "^2.6.1",
     "gulp-eslint": "^6.0.0",
     "gulp-if": "^3.0.0",
-    "gulp-mocha": "^8.0.0",
+    "gulp-mocha": "^9.0.0",
     "gulp-pug": "^5.0.0",
     "gulp-pug-linter": "^1.5.0",
     "gulp-sass": "^5.1.0",
@@ -78,7 +78,7 @@
     "webpack": "^5.72.0",
     "webpack-bundle-analyzer": "^4.5.0",
     "webpack-cli": "^4.9.2",
-    "webpack-dev-server": "^3.11.3",
+    "webpack-dev-server": "^4.9.0",
     "webpack-node-externals": "^3.0.0",
     "webpack-sentry-plugin": "^2.0.3",
     "workbox-webpack-plugin": "^6.5.3",