Lower pin the compatible version of `setuptools`

[Saransh-cpp]

I completely forgot that setuptools introduced editable installs in v64.0.0. This means that the installation will fail if a developer, who has setuptools < v64.0.0 installed locally, tries to install Zarr with pip install -e . right now.

With this PR, the local version of setuptools will be automatically updated to the compatible version.

For more information see this tweet - https://twitter.com/juanluisback/status/1557734536586625025?t=rzVtT-91AwzSOvBHanCJ9g&s=19

TODO:

• [ ] Add unit tests and/or doctests in docstrings
• [ ] Add docstrings and API docs for any new/modified user-facing classes and functions
• [ ] New/modified features documented in docs/tutorial.rst
• [ ] Changes documented in docs/release.rst
• [ ] GitHub Actions have all passed
• [ ] Test coverage is 100% (Codecov passes)