release PyICU 1.9

CHANGES

-Version 2.8.1 -> 
+Version 2.8.1 -> 2.9
 --------------------
-  - added support for ICU 71.1rc
+  - added support for ICU 71.1
   - added wrappers for UMeasurePrefix, MeasureUnit.withPrefix()|getPrefix()
   - added UNumberRoundingPriority, FractionPrecision.withSignificantDigits()
   - added UNumberTrailingZeroDisplay, Precision.trailingZeroDisplay()
-  - 
 
 Version 2.8 -> 2.8.1
 --------------------

setup.py

@@ -8,7 +8,7 @@ except ImportError:
 
 from distutils.spawn import find_executable
 
-VERSION = '2.8.1'
+VERSION = '2.9'
 ICU_MAX_MAJOR_VERSION = '71'  # max supported major version of ICU
 
 try: