package/icu: bump version to 73-1

Updated license hash due to copyright year bump:
https://github.com/unicode-org/icu/commit/9e16711b54d055cad10f7dc59f19d124ca6618be

Release notes:
https://icu.unicode.org/download/71
https://icu.unicode.org/download/72
https://icu.unicode.org/download/73

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/icu/icu.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  8d205428c17bf13bb535300669ed28b338a157b1c01ae66d31d0d3e2d47c3fd5  icu4c-70_1-src.tgz
-sha256  861671f8c712aa046f8f5ac89239e6c33821636516c5d0cc8c4e1973085f27a6  LICENSE
+sha256  a457431de164b4aa7eca00ed134d00dfbf88a77c6986a10ae7774fc076bb8c45  icu4c-73_1-src.tgz
+sha256  f3005e195ff74d8812cc1f182a1c446fab678d70a10e3dada497585befee5416  LICENSE

package/icu/icu.mk

@@ -7,7 +7,7 @@
 # Git tags (and therefore versions on release-monitoring.org) use the
 # XX-Y format, but the tarballs are named XX_Y and the containing
 # directories XX.Y.
-ICU_VERSION = 70-1
+ICU_VERSION = 73-1
 ICU_SOURCE = icu4c-$(subst -,_,$(ICU_VERSION))-src.tgz
 ICU_SITE = \
 	https://github.com/unicode-org/icu/releases/download/release-$(ICU_VERSION)