Bump minimal required CMake version

Currently, it doesn't configure properly on cmake-3.5.0 with 2 errors:
- CMake Error at CMakeLists.txt:51 (include)
  include could not find load file: FetchContent
- CMake Error at source/layers/validation/CMakeLists.txt:39 (install):
  install TARGETS given unknown argument "NAMELINK_COMPONENT".

CMakeLists.txt

@@ -1,7 +1,7 @@
 # Copyright (C) 2020-2024 Intel Corporation
 # SPDX-License-Identifier: MIT
 
-cmake_minimum_required(VERSION 3.5.0 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.12.0 FATAL_ERROR)
 set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)