Merge pull request #11705 from openlayers/dependabot/npm_and_yarn/webpack-dev-middleware-4.0.0

Bump webpack-dev-middleware from 3.7.2 to 4.0.0

package.json

@@ -65,6 +65,7 @@
     "eslint": "^7.2.0",
     "eslint-config-openlayers": "^14.0.0",
     "expect.js": "0.3.1",
+    "express": "^4.17.1",
     "front-matter": "^4.0.0",
     "fs-extra": "^9.0.0",
     "glob": "^7.1.5",
@@ -104,7 +105,7 @@
     "walk": "^2.3.9",
     "webpack": "4.44.2",
     "webpack-cli": "^4.0.0",
-    "webpack-dev-middleware": "^3.6.2",
+    "webpack-dev-middleware": "^4.0.0",
     "webpack-dev-server": "^3.3.1",
     "worker-loader": "^3.0.0",
     "yargs": "^16.0.3"