REGRESSION: [iOS] imported/w3c/web-platform-tests/webcodecs/full-cycl…

…e-test.https.any.html?h264_avc is a flaky failure

https://bugs.webkit.org/show_bug.cgi?id=248062
rdar://102490465

Unreviewed test gardening.

* LayoutTests/platform/ios/TestExpectations: Mark test as flaky.

Canonical link: https://commits.webkit.org/256809@main

LayoutTests/platform/ios/TestExpectations

@@ -3751,6 +3751,8 @@ webkit.org/b/244740 http/wpt/cross-origin-opener-policy/non-secure-to-secure-con
 
 webkit.org/b/248061 webaudio/require-transient-activation.html [ Skip ]
 
+webkit.org/b/248062 imported/w3c/web-platform-tests/webcodecs/full-cycle-test.https.any.html?h264_avc [ Pass Failure ]
+
 # These tests have similar harness errors and timeouts. See webkit.org/b/244900
 [ Debug ] imported/w3c/web-platform-tests/dom/nodes/NodeList-static-length-getter-tampered-indexOf-1.html [ Pass Timeout Failure ]
 [ Debug ] imported/w3c/web-platform-tests/dom/nodes/NodeList-static-length-getter-tampered-indexOf-2.html [ Pass Timeout Failure ]