adrienverge / yamllint / 12762721446

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cli: Fix TTY test failing on Python 3.14

Since I don't have Python 3.14 on my system (yet), here are the steps I
used to reproduce:

    sudo dnf install python3.14
    python3.14 -m venv /tmp/py3.14
    source /tmp/py3.14/bin/activate
    pip install yaml pathspec
    python3.14 -m unittest discover
    # or
    python3.14 -m unittest tests.test_cli.CommandLineTestCase.test_run_default_format_output_in_tty

This commit fixes that by piping *only* `sys.stdout`, not `sys.stderr`
too. I'm not sure why I wrote this code in 2016 (see commit a2c68fdf),
but the new one makes more sense to me now.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2336947

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