[vm] Roll third_party/icu@ to 8d29692df64066

Issue #42230

Change-Id: Id0537f982759b20854d72db21937aac4a2866a07
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151220
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

DEPS

@@ -107,7 +107,7 @@ vars = {
   "http_retry_tag": "0.1.1",
   "http_rev": "a131e563c09349f624d5421237183a06fb10552d",
   "http_throttle_tag" : "1.0.2",
-  "icu_rev" : "5005010d694e16571b8dfbf07d70817841f80a69",
+  "icu_rev" : "8d29692df640668ed7e4d1817715440c4e05697a",
   "idl_parser_rev": "5fb1ebf49d235b5a70c9f49047e83b0654031eb7",
   "intl_tag": "0.16.1",
   "jinja2_rev": "2222b31554f03e62600cd7e383376a7c187967a1",