Run tests on dotnet version 8 too

Author: evilfactory

.github/workflows/run-tests.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/setup-dotnet@6bd8b7f7774af54e05809fcc5431931b3eb1ddee # v4.0.1
         with:
           dotnet-version: |
-            6.0.x
+            8.0.x
 
       - name: Initialize environment
         run: |