libgo: bump libgo version for GCC 14 release

	PR go/113668

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/560676

gcc/go/gofrontend/MERGE

-1cb83a415e86ab4de0d436d277377d8fc060cb61
+e15a14e410b8fc5d28012d5b313cb6c8476c7df9
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/configure

@@ -2611,7 +2611,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 ac_config_headers="$ac_config_headers config.h"
-libtool_VERSION=22:0:0
+libtool_VERSION=23:0:0
 # Default to --enable-multilib

libgo/configure.ac

@@ -10,7 +10,7 @@ AC_INIT(package-unused, version-unused,, libgo)
 AC_CONFIG_SRCDIR(Makefile.am)
 AC_CONFIG_HEADER(config.h)
 
-libtool_VERSION=22:0:0
+libtool_VERSION=23:0:0
 AC_SUBST(libtool_VERSION)
 
 AM_ENABLE_MULTILIB(, ..)