Downlgrade setup-node action

Author: vrza

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: Setup Node.js ${{ matrix.node }}
-      uses: actions/setup-node@v6
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node }}
 
@@ -59,5 +59,4 @@ jobs:
       run: node node_modules/eslint/bin/eslint .
 
     - name: Run test suite
-      shell: bash
       run: node node_modules/mocha/bin/mocha tests