chore(deps-dev): update chai, chai-js, mocha and sinon deps, close symfony#753

Author: Kocal

package.json

@@ -63,8 +63,8 @@
     "@vue/compiler-sfc": "^3.0.0-beta.9",
     "autoprefixer": "^8.5.0",
     "babel-eslint": "^10.0.1",
-    "chai": "^3.5.0",
-    "chai-fs": "^1.0.0",
+    "chai": "^4.2.0",
+    "chai-fs": "^2.0.0",
     "chai-subset": "^1.6.0",
     "core-js": "^3.0.0",
     "eslint": "^5.15.2 || ^6.0.0",
@@ -79,14 +79,14 @@
     "http-server": "^0.12.3",
     "less": "^3.9.0",
     "less-loader": "^4.1.0",
-    "mocha": "^6.0.2",
+    "mocha": "^7.1.2",
     "node-sass": "^4.5.3",
     "postcss-loader": "^3.0.0",
     "preact": "^8.2.1",
     "preact-compat": "^3.17.0",
     "sass": "^1.17.0",
     "sass-loader": "^8.0.0",
-    "sinon": "^2.3.4",
+    "sinon": "^9.0.2",
     "strip-ansi": "^6.0.0",
     "stylus": "^0.54.5",
     "stylus-loader": "^3.0.2",