Update Makefile for ".[dev]"

[koaning]

📝 Summary

Totally a minor update this one. This PR changes a pip install -e .[dev] into pip install -e ".[dev]" command in the Makefile.

🔍 Description of Changes

The reason I did this is because some shells (Zshell mainly, but maybe others too) seem to have trouble parsing the command in the Makefile. Gives me this error:

zsh: no matches found: .[dev]

📋 Checklist

• [x] I have read the contributor guidelines.
• [x] For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• [x] I have added tests for the changes made.
• [x] I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

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