build(deps): fix vulnerabilities in nltk, poetry, and i18next-http-ba…

[TuringND]

• nltk: bump minimum from >=3.9.3 to >=3.9.4 (High, 7.5)
• poetry: bump from ^2.1.2 to ^2.3.4 (CVE-2026-41140, Low)
• i18next-http-backend: bump from ^3.0.2 to ^3.0.5 (GHSA-q89c-q3h5-w34g, Medium 6.5)

Made-with: Cursor

Summary of PR

Change Type

• Bug fix
• New feature
• Breaking change
• Refactor
• Other (dependency update, docs, typo fixes, etc.)

Checklist

• I have read and reviewed the code and I understand what the code is doing.
• I have tested the code to the best of my ability and ensured it works as expected.

Fixes

Resolves #(issue)

Release Notes

• Include this change in the Release Notes.