[GARDENING]: [ Debug ] inspector/debugger/async-stack-trace-truncate.…

…html is a constant timeout

https://bugs.webkit.org/show_bug.cgi?id=258181
rdar://110872552

Unreviewed test gardening.

* LayoutTests/platform/mac/TestExpectations:

Canonical link: https://commits.webkit.org/265875@main

LayoutTests/platform/mac/TestExpectations

@@ -2754,7 +2754,7 @@ webkit.org/b/256108 media/video-audio-session-mode.html [ Failure ]
 [ x86_64 ] media/media-source/media-source-webm-configuration-framerate.html [ Pass Failure ]
 [ x86_64 ] media/media-source/media-source-webm-configuration-vp9-header-color.html [ Pass Failure ]
 
-webkit.org/b/258181 [ Monterey+ Debug ] inspector/debugger/async-stack-trace-truncate.html [ Timeout ]
+webkit.org/b/258181 [ Debug ] inspector/debugger/async-stack-trace-truncate.html [ Slow ]
 
 # webkit.org/b/258328 Umbrella Bug: Batch mark expectations slowing down EWS
 [ arm64 ] imported/w3c/web-platform-tests/webaudio/the-audio-api/the-audioworklet-interface/audioworklet-denormals.https.window.html [ Failure ]