[dotnet/ci] constant version

.github/workflows/workflow.yml

@@ -82,7 +82,7 @@ jobs:
       - name: Setup .NET SDK
         uses: actions/setup-dotnet@v5
         with:
-          dotnet-version: 10.0.x
+          dotnet-version: 10.0.103
           cache: true
           cache-dependency-path: |
             Directory.Packages.props

global.json

@@ -0,0 +1,6 @@
+{
+    "sdk": {
+        "version": "10.0.103",
+        "rollForward": "latestFeature"
+    }
+}