Update build sdk to net8

Author: stefannikolei

.github/workflows/build-and-test.yml

@@ -96,14 +96,14 @@ jobs:
         uses: actions/setup-dotnet@v3
         with:
           dotnet-version: |
-            6.0.x
+            8.0.x
 
       - name: DotNet Setup Preview
         if: ${{ matrix.options.sdk-preview == true }}
         uses: actions/setup-dotnet@v3
         with:
           dotnet-version: |
-            7.0.x
+            8.0.x
 
       - name: DotNet Build
         if: ${{ matrix.options.sdk-preview != true }}