oops, rm ubuntu from the build, because the ios workload isn't there

Author: ericsink

.github/workflows/dotnet.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [windows-2022, ubuntu-24.04, macos-14]
+        os: [windows-2022, macos-14]
 
     runs-on: ${{ matrix.os }}