build(deps): update rustls and chacha20

[SequeI]

Upgrade rustls to 0.23.45 to address RUSTSEC-2026-0285 and refresh
chacha20 to replace the yanked 0.10.1 release.

Linked Issue

Closes #

Summary

Test Plan

Checklist

• An issue exists and is linked above
• All commits are signed-off, using DCO
• All new code follows the project's coding standards (CLAUDE.md) and is covered by tests
• Public-facing changes are paired with documentation updates
• If this PR introduces a major feature, capability, or security-relevant change, a corresponding NEP has been opened or accepted and is linked

[github-actions]

PR Review Summary

Size

Metric	Value
Lines added	+7
Lines removed	-7
Total changed	14
Classification	Small (< 50 lines)

Affected crates

No crate source directories are directly affected.

Blast radius — Contained

This PR touches: source code

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_{Updated automatically on each push to this PR.}

[nogent-nolabs-ai]

nogent code review

1 high-severity security issue found.

_{Automated code + security review. CI already covers clippy, rustfmt, tests, cargo-audit and commit-lint.}