chore(deps): update actions/setup-dotnet action to v5

Author: renovate[bot]

.github/workflows/dotnet.yml

@@ -18,7 +18,7 @@ jobs:
         fetch-depth: 0 # avoid shallow clone
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 8.0.x