[AI] Update Dependency - walkdir

[KCarretto]

This PR updates exactly one outdated direct dependency in the repository: walkdir from version 2.3 to 2.5. It targets the implants/lib/eldritch/eldritch/Cargo.toml file.

• Checked for open PRs for walkdir before selecting it.
• Tested by running cargo build --all-targets and cargo test --all-targets inside the implants directory, which were successful.
• Adhered to the single target scope requirement.

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PR created automatically by Jules for task 7792838285452020776 started by @KCarretto

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