chore: use deterministic dotnet version in ci

Author: FantasticFiasco

.github/workflows/ci-cd.yml

@@ -22,6 +22,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+    - uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: 8.x
     # Build
     - run: dotnet build --configuration Release
     # Test