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cmake: fix warning about minimum required version

Since CMake 3.27 compatibility with versions of CMake older than
3.5 is deprecated [1]. CMake produces annoying warning on
configuration stage:

| CMake Deprecation Warning at src/CMakeLists.txt:7 (cmake_minimum_required):
|  Compatibility with CMake < 3.5 will be removed from a future version of
|  CMake.

We cannot bump a minimum required CMake version without bumping
it in the Tarantool build system. However, we can set a maximum
supported CMake version and suppress a warning. Maximum supported
version means that this CMake version is known to work properly
and will not result in any build errors rightaway for higher
versions.

CMake 3.29.0 [1] is the latest version which used by for building
LuaJIT without issues. This version has been tested and seen
no policy warnings with that version.

1. https://cmake.org/cmake/help/v3.29/release/3.29.html
2. https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html

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