Gardening: updating status file to handle occassional timeout of io/regress_7191_test on vm-win-release-x64-be.

BUG=
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Review-Url: https://codereview.chromium.org/2629283002 .

Author: bkonyi

tests/standalone/standalone.status

@@ -282,6 +282,7 @@ io/directory_list_sync_test: Timeout, Skip # Expects to find the test directory
 
 [ $runtime == vm && $system == windows && $mode == release ]
 io/http_server_close_response_after_error_test: Pass, Timeout # Issue 28370: timeout.
+io/regress_7191_test: Pass, Timeout # Issue 28374: timeout.
 
 [ $runtime == dart_precompiled || $mode == product ]
 io/skipping_dart2js_compilations_test: CompileTimeError # Imports dart:mirrors