docs: add north-echo as a contributor for security

[allcontributors]

Adds @north-echo as a contributor for security.

This was requested by iluwatar in this comment

[skip ci]

[github-actions]

PR Summary

Adds the user north-echo (Christopher Lusk) as a contributor with the security role in the All Contributors configuration and updates the README to reflect the new contributor. This includes expanding the All Contributors list and updating the badge count from 393 to 394, as well as adding the contributor card with avatar, profile, and a security badge in the README.

Changes

File	Summary
.all-contributorsrc	Appended a new contributor entry for north-echo (Christopher Lusk) with login, name, avatar URL, profile link, and security contribution in the All Contributors configuration.
README.md	Updated the All Contributors badge to 394 and inserted Christopher Lusk’s contributor card in the contributors table with avatar, profile link, and a security badge.

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autogenerated by presubmit.ai

[github-actions]

✅ LGTM!

Review Summary

Commits Considered (2)

• ff5885e: docs: update .all-contributorsrc [skip ci]
• 9648d6d: docs: update README.md [skip ci]

Files Processed (2)

• .all-contributorsrc (1 hunk)
• README.md (2 hunks)

Actionable Comments (0)

Skipped Comments (2)

• .all-contributorsrc [3587-3596]

  best_practice: "Validate and correct contributor profile URL and domain consistency"

• README.md [9-9]

  enhancement: "Update All Contributors badge count consistency"