chore(workflow): use node-version-file instead of hardcoded node-version (#15658)

* chore(workflow): use `node-version-file` instead of hardcoded `node-version`

* chore: test min version

.github/workflows/test-misskey-js.yml

@@ -20,11 +20,6 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [22.11.0]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
     steps:
       - name: Checkout
         uses: actions/checkout@v4.2.2
@@ -32,10 +27,10 @@ jobs:
       - name: Setup pnpm
         uses: pnpm/action-setup@v4.1.0
 
-      - name: Setup Node.js ${{ matrix.node-version }}
+      - name: Setup Node.js
         uses: actions/setup-node@v4.4.0
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version-file: '.node-version'
           cache: 'pnpm'
 
       - name: Install dependencies