fix: install proper dotnet version on CI for coverage

Author: Justintime50

.github/workflows/ci.yml

@@ -81,6 +81,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.x.x
+
       - name: Set up dotnet tools and dependencies
         run: make install