[libtorrent] update to 2.0.12

[toge]

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version, or no changes were necessary.
• Any fixed CI baseline and CI feature baseline entries are removed from that file, or no entries needed to be changed.
• All patch files in the port are applied and succeed.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.

https://github.com/arvidn/libtorrent/releases/tag/v2.0.12

python features has been always failed on Windows since 2020.

if(VCPKG_TARGET_IS_WINDOWS)
    # Building python bindings is currently broken on Windows
    if("python" IN_LIST FEATURES)
        message(FATAL_ERROR "The python feature is currently broken on Windows")
    endif()
...
endif()

I think it should be defined supports in vcpkg.json.

[vicroms]

/azp run

[azure-pipelines]

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