retry to use setup-dotnet

Author: BenoitRoux0

.github/workflows/continuous.yml

@@ -11,11 +11,9 @@ jobs:
       - uses: actions/checkout@v6
         with:
             fetch-depth: 0
-      - name: 'Install dotnet 3.1'
-        shell: pwsh
-        run: |
-         (New-Object System.Net.WebClient).DownloadFile("https://dot.net/v1/dotnet-install.ps1", ".\dotnet-install.ps1")
-         .\dotnet-install.ps1 -Version 3.1.32
+      - uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: '3.1.x'
 
       - name: 'Cache: .nuke/temp, ~/.nuget/packages'
         uses: actions/cache@v4