Fix duplicate entries in Cargo.toml introduced by merge commit

[Copilot]

A merge commit accidentally duplicated several entries in Cargo.toml, which would break cargo publish and cause build warnings.

Removed duplicates

• Dependencies: bstr, serde, serde_json each appeared twice in [dependencies]
• Lint config: [lints.rust] section was duplicated in full at the end of the file

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Pull request overview

This PR fixes a broken Cargo manifest state caused by a merge commit, removing duplicated entries that would otherwise produce warnings and block publishing.

Changes:

• Removed a duplicated bstr dependency entry.
• Removed duplicated serde / serde_json entries in [dependencies].
• Removed a duplicated [lints.rust] section at the end of the manifest.

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