refactor!: minimum supported webpack version is v5.0.0 (#4656)

Author: snitin315

.github/workflows/nodejs.yml

@@ -67,10 +67,6 @@ jobs:
         node-version: [14.x, 16.x, 18.x, 19.x]
         shard: ["1/4", "2/4", "3/4", "4/4"]
         webpack-version: [latest]
-        include:
-          - node-version: 16.x
-            os: ubuntu-latest
-            webpack-version: 4
 
     runs-on: ${{ matrix.os }}
 
@@ -86,14 +82,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Update package.json for webpack@4
-        if: matrix.webpack-version == '4'
-        run: echo "`jq '.scripts.build="npm run build:client"' package.json`" > package.json
-
-      - name: Install webpack ${{ matrix.webpack-version }}
-        if: matrix.webpack-version == '4'
-        run: npm i webpack@${{ matrix.webpack-version }} --save-dev --ignore-scripts
-
       - name: Setup firefox
         if: matrix.os != 'windows-latest'
         uses: browser-actions/setup-firefox@latest