chore: update net version

Author: andrueastman

.github/workflows/validatePullRequest.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup .NET
         uses: actions/[email protected]
         with:
-          dotnet-version: 6.0.x
+          dotnet-version: 8.x
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3
         with: