Merge pull request #22930 from michaelnebel/csharp/net11rc3test

C#: Update the .NET 11 test to use RC 3.

Author: michaelnebel

csharp/ql/integration-tests/all-platforms/dotnet_11/global.json

@@ -1,5 +1,5 @@
 {
     "sdk": {
-        "version": "11.0.100-rc.1.26425.128"
+        "version": "11.0.100-rc.3.26522.148"
     }
 }