updated .NET version to 9.0.x

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build

.github/workflows/static.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Dotnet Setup
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 8.x
+        dotnet-version: 9.0.x
 
     - run: dotnet tool update -g docfx
     - run: docfx ./docs/docfx.json