CI: Upgrade eslint to use node 22

Author: okurz

.github/workflows/eslint.yml

@@ -4,19 +4,11 @@ name: eslint
 on: [push, pull_request]
 jobs:
   test:
-    name: Node ${{ matrix.node-version }} and ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        node-version: [18.x]
-        os: [ubuntu-latest]
     steps:
     - uses: actions/checkout@v5
-    - name: Use Node ${{ matrix.node-version }}
-      uses: actions/setup-node@v6
+    - uses: actions/setup-node@v6
       with:
-        node-version: ${{ matrix.node-version }}
+        node-version: '22'
     - name: npm install
       run: npm install --ignore-scripts
     - name: npm run lint