Updated sigstore dependency.

[MicahGale]

Pull Request Checklist for MontePy

Description

This is a hot fix that is a little bit of a YOLO.

---

General Checklist

• I have performed a self-review of my own code.
• The code follows the standards outlined in the development documentation.
• I have added tests that prove my fix is effective or that my feature works (if applicable).

---

Documentation Checklist

• I have documented all added classes and methods.
• For infrastructure updates, I have updated the developer's guide.
• For significant new features, I have added a section to the getting started guide.

---

First-Time Contributor Checklist

• If this is your first contribution, add yourself to pyproject.toml if you wish to do so.

---

Additional Notes for Reviewers

Ensure that:

• The submitted code is consistent with the merge checklist outlined here.
• The PR covers all relevant aspects according to the development guidelines.
• 100% coverage of the patch is achieved, or justification for a variance is given.
  """