refactor!: drop support for webpack-dev-server@v4 (#4301)

Author: snitin315

.github/workflows/nodejs.yml

@@ -62,13 +62,6 @@ jobs:
         shard: ["1/4", "2/4", "3/4", "4/4"]
         webpack-version: [latest]
         dev-server-version: [latest]
-        include:
-          - node-version: 18.x
-            os: ubuntu-latest
-            dev-server-version: 4
-          - node-version: 20.x
-            os: ubuntu-latest
-            dev-server-version: 4
 
     steps:
       - uses: actions/checkout@v4
@@ -89,10 +82,6 @@ jobs:
       - name: Install dependencies
         run: yarn --frozen-lockfile --ignore-engines --ignore-scripts
 
-      - name: Install webpack-dev-server ${{ matrix.dev-server-version }}
-        if: matrix.dev-server-version == '4'
-        run: yarn add -W -D webpack-dev-server@${{ matrix.dev-server-version }} --ignore-engines --ignore-scripts
-
       - name: Prepare environment for tests
         run: yarn build:ci