Version fix for DocSum requirements (unstructured, langchain)

[okhleif-IL]

Description

This is a bugfix for DocSum URL Summarization. Fixed version for langchain and unstructured in order to bypass nltk related bug occurring in URL summarization.

in newer versions of langchain_community and unstructured, the following would be required in a user's environment.
import nltk
nltk.download("punkt_tab")
nltk.download("averaged_perceptron_tagger_eng")

Older versions of said libraries include handle these requirements automatically

Issues

Although the original suspicion was different, this is a fix for #1464

Type of change

List the type of change like below. Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would break existing design and interface)
• Others (enhancement, documentation, validation, etc.)

Dependencies

Fixed langchain and unstructured to older set versions.

Tests

Manually rebuilt, composed, and tested via UI

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

DocSum/ui/gradio/requirements.txt

Package	Version	License	Issue Type
langchain_community	0.3.9	Null	Unknown License

Scanned Files

• DocSum/ui/gradio/requirements.txt

[okhleif-IL]

If there is some reluctance to peg versions, an alternative solution would be to add this to the dockerfile:
RUN python3 -c "import nltk;nltk.download('punkt_tab');nltk.download('averaged_perceptron_tagger_eng')"