Include prerrelease versions when resolving required_conan_version

[czoido]

Changelog: Fix: Add pre-release versions when resolving required_conan_version.
Docs: omit

When resolving required_conan_version, Conan did not take into account the prerelease versions, so for example 1.29.0-dev was not being resolved as >=1.28.0 so this was failing.

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^{Note: By default this PR will skip the slower tests and will use a limited set of python versions. Check here how to increase the testing level by writing some tags in the current PR body text.}