Merge pull request #4 from Toine-db/net9-release

release net9

.github/workflows/release-nuget.yml

@@ -12,6 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '9.0.x'
       - name: Verify commit exists in origin/main
         run: |
           git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*