Updated .NET SDK version per security recommendation. (dotnet#3964)

Author: paulmedynski

global.json

@@ -15,7 +15,7 @@
     // system, etc.) may use their own installed SDKs unless configured
     // otherwise.
     //
-    "version": "10.0.101",
+    "version": "10.0.103",
 
     // Any 10.x version is acceptable.
     "rollForward": "latestMinor",