ci: update node.js minor versions

Author: ruisaraiva19

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
     name: Node.js ${{ matrix.node }}
     strategy:
       matrix:
-        node: ['10', '11', '12', '13', '14', '15', '16']
+        node: ['10.x', '11.x', '12.x', '13.x', '14.x', '15.x', '16.x']
     steps:
       - name: Checkout
         uses: actions/checkout@v2