test: try upgrading npm for node v4 tests re: #12297

Author: vkarpov15

.github/workflows/test.yml

@@ -18,9 +18,9 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
 
-      - name: Upgrade Node 5 npm
+      - name: Upgrade Node <= 5 npm
         run: npm install -g npm@3
-        if: ${{ matrix.node == 5 }}
+        if: ${{ matrix.node <= 5 }}
 
       - run: npm install