Update Xcode version to 26.1 in build workflow

Author: TheCodeTraveler

.github/workflows/dotnet-build.yml

@@ -43,7 +43,7 @@ env:
   PathToCommunityToolkitMediaElementAnalyzersCodeFixCsproj: 'src/CommunityToolkit.Maui.MediaElement.Analyzers.CodeFixes/CommunityToolkit.Maui.MediaElement.Analyzers.CodeFixes.csproj'
   PathToCommunityToolkitAnalyzersUnitTestProjectDirectory: 'src/CommunityToolkit.Maui.Analyzers.UnitTests'
   PathToCommunityToolkitAnalyzersBenchmarkCsproj: 'src/CommunityToolkit.Maui.Analyzers.Benchmarks/CommunityToolkit.Maui.Analyzers.Benchmarks.csproj'
-  CommunityToolkitLibrary_Xcode_Version: '26.0.1'
+  CommunityToolkitLibrary_Xcode_Version: '26.1'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}