update issue reference

Author: stephybun

.changes/unreleased/NOTES-20250918-095859.yaml

@@ -2,4 +2,4 @@ kind: NOTES
 body: 'all: This Go module has been updated to Go 1.24 per the Go support policy. It is recommended to review the Go 1.24 release notes before upgrading.'
 time: 2025-09-18T09:58:59.693223+02:00
 custom:
-    Issue: "550"
+    Issue: "551"