Bug 1792775 - Part 12: Bump minimum required ICU version to 72.1. r=platform-i18n-reviewers,dminor

Require at least ICU 72, because we're using ICU APIs which are only stable
in ICU 72.

Differential Revision: https://phabricator.services.mozilla.com/D160190

js/moz.configure

@@ -1016,7 +1016,7 @@ set_define(
 # ======================================================
 system_lib_option("--with-system-icu", help="Use system ICU")
 
-system_icu = pkg_check_modules("MOZ_ICU", "icu-i18n >= 71.1", when="--with-system-icu")
+system_icu = pkg_check_modules("MOZ_ICU", "icu-i18n >= 72.1", when="--with-system-icu")
 
 
 @depends("--with-system-icu")