Update bug_report.yaml (#10610)

Author: RDMacLachlan

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -35,7 +35,7 @@ body:
       label: NuGet package version
       description: If you are seeing your issue on older versions please try the latest release
       options:
-        - "WinUI 3 - Windows App SDK 1.7.2: 1.7.250513003"
+        - "WinUI 3 - Windows App SDK 1.7.3: 1.7.250606001"
         - "WinUI 3 - Windows App SDK 1.7 Preview 1: 1.7.250208002-preview1"
         - "WinUI 3 - Windows App SDK 1.8 Experimental 1: 1.8.250515001-experimental2"
         - "WinUI 2 - Microsoft.UI.Xaml 2.8.2"