Resolve duplicate `[bans]` and `[sources]` blocks in `deny.toml`

[nanaf6203-bit]

Problem Statement

deny.toml declares both [bans] multiple-versions = "warn" and [sources] unknown-* twice; cargo-deny produces warnings.

Why it matters

Duplicate blocks risk being actively ignored by future tooling; tidying ensures deterministic linting.

Technical Context

Merge duplicates; move deprecated unknown-git = "warn" to deny.

Expected Outcome

deny.toml parses with no warning; cargo deny runs clean.

Acceptance Criteria

1. cargo deny check produces no warnings.
2. File under 30 LOC.
3. Changelog note.

Implementation Notes

Single edit.

Files or modules likely to be affected

deny.toml.

Dependencies

None.

Difficulty level

EASY.

Estimated effort

XS (~15 min).

[midenotch]

@midenotch has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

This issue aligns well with my experience. I can work on it and submit a polished PR for review.

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[dhareymu]

@dhareymu has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Maintainer, abeg gimme this project 🙏🙏😭😭

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[ohamamarachi474-del]

@ohamamarachi474-del has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

can i work on this issue ???

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[drips-wave]

Congratulations, @ohamamarachi474-del! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @ohamamarachi474-del: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @ohamamarachi474-del as part of the Stellar Wave Program's 7th Wave 🥳

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