Fix no space left on device error in CI during docker build

[tjduigna]

Alternative pytorch install that is more economical on disk space for CI docker build.

[github-actions[bot]]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/plinder/eval/docking
make_plots.py
stratify_test_set.py
utils.py
write_scores.py					63-64, 134-135
Project Total

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