CI: rename the .NET setup step

Author: ForNeVeR

.github/workflows/build-rd-net.yml

@@ -16,7 +16,7 @@ jobs:
     timeout-minutes: 15
     steps:
     - uses: actions/checkout@v3
-    - name: Setup .NET Core SDK
+    - name: Setup .NET SDK
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: '7.0.x'