Fix solution name.

Author: Nihlus

.github/workflows/dotnet.yml

@@ -36,7 +36,7 @@ jobs:
         uses: JetBrains/[email protected]
         with:
           tool-version: 2024.3.0
-          solution: Remora.Discord.sln
+          solution: Remora.Extensions.Options.Immutable.sln
           build: false
           no-build: true