Fix pip install path in mmlu.ipynb

[RangeKing]

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Eval details 📑

The current pip command in mmlu.ipynb will raise an error as blow.

ERROR: file:https:///home/ubuntu/repo/evals/examples does not appear to be a Python project: neither 'setup.py' nor 'pyproject.toml' found.

This PR modifies the command to be consistent with lafand-mt.ipynb

[andrew-openai]

Thanks for the fix!