update ICU version in the comment

Author: real-dam

builds/posix/make.defaults

@@ -101,7 +101,7 @@ GLOB_OPTIONS:=
 
 #____________________________________________________________________________
 
-# Firebird needs no RTTI, make it build with icu-75.1
+# Firebird needs no RTTI, make it build with icu-76.1
 RTTI_FLAG:= -fno-rtti -DU_SHOW_CPLUSPLUS_API=0 -DU_SHOW_CPLUSPLUS_HEADER_API=0
 
 # If this is defined then we use special rules useful for developers only