Update ChangeLog and bump version to v2.6.0 GA

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

ChangeLog.md

@@ -4,8 +4,8 @@ Change Log
 All notable changes to the project are documented in this file.
 
 
-[v2.6.0][UNRELEASED]
+[v2.6.0][] - 2023-09-17
---------------------
+-----------------------
 
 ### Changes
 - New APIs from the [Infix Project](https://github.com/kernelkit/infix):

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT(libite, 2.6.0-rc1, https://github.com/troglobit/libite/issues)
+AC_INIT(libite, 2.6.0, https://github.com/troglobit/libite/issues)
 AC_CONFIG_AUX_DIR(aux)
 AM_INIT_AUTOMAKE([1.11 foreign dist-xz])
 AM_SILENT_RULES([yes])