Update bug-report.yaml (#4549)

Release 1.5.5

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -35,7 +35,7 @@ body:
       label: NuGet package version
       description: Specify the version of Windows App SDK (or Project Reunion) you're using.
       options:
-        - "Windows App SDK 1.5.4: 1.5.240607001"
+        - "Windows App SDK 1.5.5: 1.5.240627000"
         - "Windows App SDK 1.5 Preview 1: 1.5.240205001-preview1"
         - "Windows App SDK 1.6 Experimental 2: 1.6.240701003-experimental2"
   - type: dropdown