fix: Correct the docling dependencies and Chroma in particular

[erichare]

This pull request updates dependency version constraints for Chroma-related packages and improves how the limit parameter is handled in the Chroma vector store component to prevent potential issues with invalid or empty values.

Dependency version updates:

• Updated chromadb dependency constraint to allow versions >=0.5.6,<0.6.0 in pyproject.toml for better compatibility and flexibility.
• Updated langchain-chroma dependency constraint to allow versions >=0.1.4,<0.2.0 in pyproject.toml.

Chroma vector store improvements:

• Improved handling of the limit parameter in build_vector_store and _add_documents_to_vector_store methods in chroma.py by converting it to an integer only when it is not None or empty, preventing issues with invalid values. [1] [2]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 23.24%. Comparing base (005f926) to head (9492e09).
⚠️ Report is 1 commits behind head on release-1.6.0-follow-ups.

❌ Your project status has failed because the head coverage (45.52%) is below the target coverage (55.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                     Coverage Diff                      @@
##           release-1.6.0-follow-ups    #9925      +/-   ##
============================================================
- Coverage                     23.25%   23.24%   -0.02%     
============================================================
  Files                          1090     1090              
  Lines                         39837    39837              
  Branches                       5530     5530              
============================================================
- Hits                           9264     9259       -5     
- Misses                        30402    30407       +5     
  Partials                        171      171              

Flag	Coverage Δ
backend	45.52% <ø> (-0.04%)	⬇️

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