chore(embedchain): Update pyproject.toml dependencies (langchain-openai & pypdf)

[harshadk-sourcefuse]

Description

Summary

• Updated langchain-openai and pypdf versions in pyproject.toml to allow support for the latest OpenAI models and resolve compatibility issues.
• Fixed failing test cases caused by outdated dependencies.
• Verified all test cases after updates — 100% are passing.

Why This Change

• Previous dependency restrictions were blocking upgrades to the latest langchain-openai, which is required for supporting new models (e.g., o3, 5mini).
• Updated pypdf to remove version lock issues and improve compatibility.

Testing

• Ran full test suite locally.
• ✅ All tests are passing (100%).

Fixes # (issue)
3355

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Please delete options that are not relevant.

• Unit Test

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[CLAassistant]

All committers have signed the CLA.