package.json: fix some old dependencies

Author: rrooij

package.json

@@ -33,21 +33,21 @@
     "coveralls": "^3.0.9",
     "cross-env": "^5.2.1",
     "prettier": "^1.19.1",
-    "eslint": "5.16.0",
+    "eslint": "7.9.0",
     "eslint-config-prettier": "6.11.0",
     "eslint-plugin-import": "^2.19.1",
     "eslint-plugin-prettier": "3.1.3",
     "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.2.0",
     "install": "^0.13.0",
-    "mocha": "^6.2.2",
+    "mocha": "^8.1.3",
     "nyc": "^15.0.0",
     "rimraf": "^2.7.1",
-    "sinon": "^7.5.0",
+    "sinon": "^9.0.3",
     "uglify-js": "^3.8.0",
     "webpack": "^4.41.6",
     "webpack-cli": "^3.3.11",
-    "webpack-dev-server": "^3.10.3"
+    "webpack-dev-server": "^3.11.0"
   },
   "scripts": {
     "doc": "documentation build lib/** -f html -o public_pages/$npm_package_version/docs",