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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 <policy_max> (introduced in CMake 3.12, see [1]) and suppress
a warning. <policy_max> means that this CMake version is known to
work properly and will not result in any build errors rightaway
for higher versions.

Note, that a current CMake minimum required version in Tarantool
is equal to 2.8, but <policy_max> is introduced in CMake 3.12 [1].
However, according to [1] it is not a problem, because if CMake is
"older than 3.12, the extra ... dots will be seen as version
component separators, resulting in the ...<max> part being ignored
and preserving the pre-3.12 behavior of basing policies on <min>".

<policy_max> is set to 3.18 because compatibility with versions
of CMake older than 2.8.12 is deprecated. Calls to
cmake_minimum_required(VERSION) that do not specify at
least 2.8.12 as their policy version (optionally via ...<max>)
will produce a deprecation warning in CMake 3.19 and above [2].
Compatibility with 2.8.12 is needed for CMP0002 [3].

1. https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html
2. https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html#policy-settings
3. https://cmake.org/cmake/help/latest/policy/CMP0002.html

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