Update requirements.txt

[drew2a]

Related to #6352 #6512 #6840

This PR adds libtorrent==1.2.15 to requirements.txt.

This version of libtorrent has been tested on macOS, Linux, and Windows.

[drew2a]

Tests on Windows 64-bit reported the following error:

ImportError while loading conftest 'E:\jenkins\workspace\GH_Tribler_PR_Tests\PR_win64_pytest\tribler\src\tribler\core\conftest.py'.
src\tribler\core\conftest.py:17: in <module>
    from tribler.core.components.libtorrent.download_manager.download_manager import DownloadManager
src\tribler\core\components\libtorrent\download_manager\download_manager.py:53: in <module>
    lt.create_ut_metadata_plugin,
src\tribler\core\components\libtorrent\utils\libtorrent_helper.py:17: in __getattr__
    raise ImportError('libtorrent library is not installed')
E   ImportError: libtorrent library is not installed

UPD: we have tested libtorrent==1.2.15 on a Windows machine. It works fine along with choco install openssl.

Ref: https://github.com/arvidn/libtorrent/blob/RC_2_0/.github/workflows/windows.yml

[drew2a]

I'm testing hidden peer discovery by executing the following commands:

export LD_PRELOAD="/usr/lib/x86_64-linux-gnu/libtcmalloc_minimal.so.4"
export PYTHONPATH=$PWD/tribler/src:${PYTHONPATH}
export EXPERIMENT_RUN_TIME=${duration}

cd $PWD/tribler
echo ---------------------------------------------------------------create venv
python3 -m venv ./venv
. ./venv/bin/activate

echo ------------------------------------------------------install requirements
python3 -m pip install --upgrade setuptools pip
python3 -m pip install --upgrade -r ./requirements-core.txt
python3 -m pip list

echo ------------------------------------------------------start the experiment
python3 ./scripts/experiments/tunnel_community/hidden_peer_discovery.py

export R_LIBS_USER=$R_LIBS_USER${R_LIBS_USER:+:}$HOME/R
R --no-save < ./scripts/experiments/tunnel_community/hidden_peer_discovery.r

echo -----------------------------------------------------------deactivate venv
deactivate

https://jenkins-ci.tribler.org/job/tunnel_experiments/job/hidden_peer_discovery/239/

UPD: it works

[sonarcloud]

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[drew2a]

libgcrypt20 has been installed on the Linux machine:

sudo apt install libgcrypt20-dev

Ref: https://github.com/arvidn/libtorrent/blob/RC_2_0/.github/workflows/linux.yml