Commit 3a2a8a2a for libheif

commit 3a2a8a2aace708d420aa3122e317209437f6917e
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Wed Dec 31 14:02:35 2025 +0100

    increase version to v1.21.1

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f0727f22..c264dd6f 100644
--- a/CMakeLists.txt
+++ b/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 1.21.0)
+project(libheif LANGUAGES C CXX VERSION 1.21.1)

 # 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.