Fixing setup-dotnet reference

Author: Piedone

.github/workflows/pr_ci.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/setup-node@v4
       with:
         node-version: "15"
-    - uses: ./.github/actions/setup-dotnet
+    - uses: OrchardCMS/OrchardCore/.github/actions/setup-dotnet@main
     - name: Build
       # We disable NuGet audit warnings, see https://learn.microsoft.com/en-us/nuget/reference/errors-and-warnings/nu1901-nu1904.
       # Security issues being discovered in NuGet packages we use can happen at any time, and thus all our CI builds that