Run tests on correct GH actions runner

Author: Swimburger

.github/workflows/ci.yml

@@ -28,13 +28,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        framework: [net462, net6.0]
+        framework: [net462, net8.0]
         os: [ubuntu-latest, windows-latest]
         exclude:
           - os: ubuntu-latest
             framework: net462
     name: Run Tests on ${{ matrix.os }} with ${{ matrix.framework }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repo
         uses: actions/checkout@v4
@@ -44,9 +44,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: |
-            8.x
-            6.x
+          dotnet-version: 8.x
 
       - name: Install tools
         run: |