COMP: Update CMake minimum required version from 3.13.4 to 3.20.6

jcfr · jcfr · commit fb3c43d7f508 · 2025-06-23T14:58:51.000-04:00
This commit is done anticipating the use of generator expression with
`add_custom_command`.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,5 +1,5 @@
 #-----------------------------------------------------------------------------
-cmake_minimum_required(VERSION 3.13.4)
+cmake_minimum_required(VERSION 3.20.6)
 #-----------------------------------------------------------------------------
 
 project(vtkAddon
