bump twine to 7.0.0 to support Core Metadata 2.5 (PEP 794)

[ronnll]

flit_core 4.0.1 was released on PyPI and it's the first version to use the new Import-Name metadata field (PEP 794). Since Fromager has no version cap, it gets pulled in as a build dep for basically everything. Our twine (6.2) doesn't understand that field and rejects the upload. To fix this, we need to bump twine to 7.0 in plumbing/utils

Summary by Sourcery

Bump the twine dependency in the utils plumbing to version 7.0.0 to support newer core metadata, refreshing its related requirements.

Enhancements:

• Update utils requirements lockfile to reflect regeneration with Python 3.12.
• Refresh transitive dependencies of twine, including packaging and rich, to compatible newer versions.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Update plumbing/utils pinned dependencies to use twine 7.0.0 (which supports Core Metadata 2.5 / PEP 794) and align its direct transitive dependencies accordingly, along with updating the pip-compile Python version header comment.

File-Level Changes

Change	Details	Files
Bump twine to 7.0.0 to support Core Metadata 2.5 (PEP 794) and refresh its related pins.	Update the pinned twine version from 6.2.0 to 7.0.0 with new hash values in the autogenerated requirements file. Update the pinned packaging dependency to 26.3 with corresponding hashes, reflecting twine’s newer dependency constraints. Update the pinned rich dependency to 15.0.0 with corresponding hashes, matching the dependency set required by twine 7.0.0. Adjust the header comment in the autogenerated requirements file to reflect that it is now generated with Python 3.12 instead of Python 3.14.	utils/requirements.txt

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[sourcery-ai]

Hey - I've left some high level feedback:

• The requirements header now indicates generation with Python 3.12; please confirm this matches the actual environment used for pip-compile to avoid subtle cross-version resolution differences.
• With the twine bump to 7.0.0, consider reviewing any existing twine CLI invocations in this repo to ensure no deprecated or removed flags/behaviors are relied upon.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The requirements header now indicates generation with Python 3.12; please confirm this matches the actual environment used for pip-compile to avoid subtle cross-version resolution differences.
- With the twine bump to 7.0.0, consider reviewing any existing twine CLI invocations in this repo to ensure no deprecated or removed flags/behaviors are relied upon.

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