Add scipy for recent constraints work

[jamie256]

Description

Constraints use scipy but we don't reference as an install dependency, adding to pyproject.toml

General Checklist

• Tests added for this feature/bug
  if it was a bug, test must cover it.
• Conform by the style guides, by using formatter
• Documentation updated
• (optional) Please add a label to your PR

[coveralls]

Pull Request Test Coverage Report for Build 1747109269

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on dev/jamie/scipy at 81.889%

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Totals
Change from base Build 1743181373:	81.9%
Covered Lines:	4309
Relevant Lines:	5134

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💛 - Coveralls