Update bug-report.yaml (#5602)

Author: RDMacLachlan

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -38,7 +38,7 @@ body:
       options:
         - "Windows App SDK 1.7.3: 1.7.250606001"
         - "Windows App SDK 1.7 Preview 1: 1.7.250208002-preview1"
-        - "Windows App SDK 1.8 Experimental 2: 1.8.250515001-experimental2"
+        - "Windows App SDK 1.8 Experimental 4: 1.8.250702007-experimental4"
   - type: dropdown
     attributes:
       label: Packaging type