fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-Y18N-1021887

package.json

@@ -27,7 +27,7 @@
     "jquery": "^3.5.1",
     "jquery-pjax": "~2.0",
     "js-yaml": "^3.14.0",
-    "laravel-mix": "^5.0.7",
+    "laravel-mix": "^5.0.8",
     "leaflet": "^1.3.4",
     "leaflet-ajax": "2.1.0",
     "leaflet-providers": "1.0.*",
@@ -46,8 +46,8 @@
     "select2": "^4.0.13",
     "ssri": "^5.3.0",
     "tar": ">=4.4.2",
-    "webpack": "^4.44.2",
-    "webpack-cli": "^3.3.12",
+    "webpack": "^5.1.1",
+    "webpack-cli": "^4.0.0",
     "x-editable": "1.5.1"
   },
   "devDependencies": {