Bump CT2 version

Author: BluSpring

gradle.properties

@@ -1,5 +1,4 @@
 unitytranslate_version = 0.4.0
 
-# This isn't actually used in the download process, however it's used for the sake of caching the downloaded files.
 # https://github.com/OpenNMT/CTranslate2/blob/master/python/ctranslate2/version.py
-ct2_version = 4.5.0
+ct2_version = 4.6.0