fix actions

Author: KSemenenko

.github/workflows/dotnet.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: 9.0.x
 
         # run build and test           
       - name: Restore dependencies

.github/workflows/nuget.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: 9.0.x
 
       - name: Restore dependencies
         run: dotnet restore