chore: update webpack-dev-server peer dependency version (#4793)

Author: bjohansebas

.changeset/dev-server-v6-peer.md

@@ -0,0 +1,5 @@
+---
+"webpack-cli": minor
+---
+
+feat: allow `webpack-dev-server` v6 as an optional peer dependency (`^5.0.0 || ^6.0.0`)

packages/webpack-cli/package.json

@@ -49,7 +49,7 @@
     "toml": "^3.0.0 || ^4.0.0",
     "webpack": "^5.101.0",
     "webpack-bundle-analyzer": "^4.0.0 || ^5.0.0",
-    "webpack-dev-server": "^5.0.0"
+    "webpack-dev-server": "^5.0.0 || ^6.0.0"
   },
   "peerDependenciesMeta": {
     "js-yaml": {