Require CMake 3.23

This is needed for File Sets support.

CMakeLists.txt

@@ -2,7 +2,7 @@
 #                                                                                                                     
 # SPDX-FileCopyrightText: Louis Moureaux <louis.moureaux@cern.ch>
 
-cmake_minimum_required(VERSION 3.17...3.28 FATAL_ERROR)                                                               
+cmake_minimum_required(VERSION 3.23...3.28 FATAL_ERROR)                                                               
 
 # Set a useful default install directory but let the user override it
 set(CMAKE_INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/tools" CACHE PATH

cmake/TUnfold/CMakeLists.txt

@@ -2,7 +2,7 @@
 #
 # SPDX-FileCopyrightText: Louis Moureaux <louis.moureaux@cern.ch>
 
-cmake_minimum_required(VERSION 3.17..3.26 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.23..3.26 FATAL_ERROR)
 project(TUnfold VERSION 17.9 LANGUAGES CXX)
 
 find_package(ROOT 6.24 REQUIRED)