chore: bump NosCore.Packets to 21.0.0

[denislauri1999]

Picks up NosCoreIO/NosCore.Packets#494 and #495.

What it brings that matters here:

• gidx's family id is now a nullable id, so the packet finally matches what a capture shows — gidx 1 521919 5083 [NDM](Gardien) 3 with a family, gidx 1 741328 -1 - 0 without. Both reproduce exactly on 21.0.0. This is what feat(family): a character's family is loaded, named, and described #2283 needs to send the family tag at all.
• sc_n's boots slot is dotted like the other three.

Builds and tests clean — nothing in this repository referenced GidxFamilySubPacket, so the breaking part of the major bump costs nothing.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the centrally managed packet library to version 21.0.0.
  • No user-facing features or behavior changes were introduced.

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 34544c4 and 6d19d81.

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• Directory.Packages.props

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Walkthrough

The centrally managed NosCore.Packets package version was updated from 20.0.3 to 21.0.0.

Changes

Package upgrade

Layer / File(s)	Summary
Update NosCore.Packets version Directory.Packages.props	The centrally managed NosCore.Packets dependency now uses version 21.0.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 6d19d

This updates packet handling to the 21.0.0 contract for nullable family IDs and the corrected boots-slot format. Builds and tests are clean, and no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: erwan-joly

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the package version update, which is the main change in the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[erwan-joly]

Superseded by #2287, which is already on master and bumps NosCore.Algorithm to 2.1.0 in the same change. Thanks for catching the release though — nothing lost.