Fix linux build

Author: marcin-golebiowski

.github/workflows/test-linux.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup dotnet tooling
       uses: actions/setup-dotnet@master
       with:
-        dotnet-version: '6.0.x'
+        dotnet-version: '8.0.x'
 
     - name: Restore dependencies
       run: