drop @typescript-eslint v4 support

Author: baseballyama

.github/workflows/NodeCI.yml

@@ -103,26 +103,6 @@ jobs:
         run: pnpm install
       - name: Test
         run: pnpm run test
-  test-for-ts-eslint-v4:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        node-version: [14.x]
-    steps:
-      - uses: actions/checkout@v4
-      - uses: pnpm/action-setup@v2
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
-        with:
-          node-version: ${{ matrix.node-version }}
-      - name: Install @typescript-eslint v4
-        run: |+
-          pnpm install -D @typescript-eslint/parser@4 @typescript-eslint/eslint-plugin@4 eslint@7 svelte@3
-          rm -rf node_modules
-      - name: Install Packages
-        run: pnpm install
-      - name: Test
-        run: pnpm run test
   test-for-eslint-v7:
     runs-on: ubuntu-latest
     strategy: