deps: update ICU to 73.1 release

- Details: https://icu.unicode.org/download/73

Author: srl295

LICENSE

@@ -1,8 +1,8 @@
 ICU sources - auto generated by shrink-icu-src.py
 
 This directory contains the ICU subset used by --with-intl=full-icu
-It is a strict subset of ICU 72 source files with the following exception(s):
-* deps/icu-small/source/data/in/icudt72l.dat.bz2 : compressed data file
+It is a strict subset of ICU 73 source files with the following exception(s):
+* deps/icu-small/source/data/in/icudt73l.dat.bz2 : compressed data file
 
 
 To rebuild this directory, see ../../tools/icu/README.md

deps/icu-small/LICENSE

@@ -1,11 +1,11 @@
-# © 2020 and later: Unicode, Inc. and others.
-# License & terms of use: http://www.unicode.org/copyright.html
-
----
-Language: Cpp
-BasedOnStyle: LLVM
-IndentWidth: 4
-ColumnLimit: 105
-AllowShortBlocksOnASingleLine: false 
-AllowShortIfStatementsOnASingleLine: true 
-...
+# © 2020 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
+
+---
+Language: Cpp
+BasedOnStyle: LLVM
+IndentWidth: 4
+ColumnLimit: 105
+AllowShortBlocksOnASingleLine: false 
+AllowShortIfStatementsOnASingleLine: true 
+...