Ajustado o script de builda para .net 9.

Author: rftd

.github/workflows/publish.yml

@@ -34,7 +34,9 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: '8.x'
+        dotnet-version: |
+          8.x
+          9.x
     - run: dotnet msbuild OpenAC.Net.NFSe.sln -property:Configuration=Release -property:platform="Any CPU"
       working-directory: src
     - run: dotnet pack --configuration Release --output ${{ env.NuGetDirectory }}