Update main.yaml

adds explicit node version

.github/workflows/main.yaml

@@ -15,6 +15,10 @@ jobs:
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3
+    - name: Use Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20.x'
     - name: Get branch name
       id: get_branch
       run: |
@@ -99,4 +103,4 @@ jobs:
       - name: Publish to Nuget
         run: nuget push **\*.nupkg -Source https://api.nuget.org/v3/index.json
       - name: Publish to Github Nuget
-        run: nuget push **\*.nupkg -Source github
+        run: nuget push **\*.nupkg -Source github