(actions) reduce version to major version

Author: MatthijsBurgh

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
         node-version: [12, 14]
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2.1.3
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - uses: actions/cache@v2