Bug 1763783 - Part 11: Updating ICU requires a clobber. r=platform-i18n-reviewers,jfkthame

Depends on D143283

Differential Revision: https://phabricator.services.mozilla.com/D143284

CLOBBER

@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Merge day clobber 2022-04-04
+Bug 1763783 - Update to ICU 71 requires clobber