Update bug-report.yaml for 1.4 experimental 1 (#3654)

Author: duncanmacmichael

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -37,7 +37,7 @@ body:
       options:
         - "Windows App SDK 1.3.1: 1.3.230502000"
         - "Windows App SDK 1.3 Preview 1: 1.3.230228005-preview1"
-        - "Windows App SDK 1.3 Experimental 1: 1.3.230202101-experimental1"
+        - "Windows App SDK 1.4 Experimental 1: 1.4.230518007-experimental1"
   - type: dropdown
     attributes:
       label: Packaging type