eslint -v8 and v9 for actions

Author: DianaSuvorova

.github/workflows/tests.yml

@@ -14,13 +14,16 @@ jobs:
     strategy:
       matrix:
         node-version: [16.x, 18.x, 20.x]
+        eslint-version: [8.x, 9.x]
 
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
+    - name: Install ESLint ${{ matrix.eslint-version }}
+        run: npm install eslint@${{ matrix.eslint-version }}
     - run: npm install
     - run: npm test
       env: