Remove Linux wheels from CI tests

[lanctot]

See #1441 and log here: https://github.com/google-deepmind/open_spiel/actions/runs/20958555334

[alexunderch]

@lanctot additionally: macos_15_python_3.13 doesn't run full tests Skipping full tests for Python 3.14 wheel. but it's python 3.13.

I think it's about this is due to this in python_extra_deps.sh
elif verlt $PY_VER 3.14; then echo "Detected Python version 3.13"

my tests with updated linux image ran successfully, so maybe this is unnecessary
https://github.com/google-deepmind/open_spiel/actions/runs/20960627184

[lanctot]

Yes, this is on purpose: we're not fully supporting Python 3.14 yet. We build the wheel and test it inside the VM (basic tests) but not the full tests. We'll enable that in the future.