increase version to v1.17.6

Author: farindk

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.16.3) # Oldest Ubuntu LTS (20.04 currently)
 
-project(libheif LANGUAGES C CXX VERSION 1.17.5)
+project(libheif LANGUAGES C CXX VERSION 1.17.6)
 
 # compatibility_version is never allowed to be decreased for any specific SONAME.
 # Libtool in the libheif-1.15.1 release had set it to 17.0.0, so we have to use this for the v1.x.y versions.