[Bug fix] Fix issue related to get_data_sources() method

[deshraj]

Description

Noticed the issue where get_data_sources() function is failing due to the recent change in the schema.

Type of change

• Bug fix (non-breaking change which fixes an issue)

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 55.85%. Comparing base (c77a75d) to head (50df825).

Files	Patch %	Lines
embedchain/app.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1295   +/-   ##
=======================================
  Coverage   55.85%   55.85%           
=======================================
  Files         153      153           
  Lines        6169     6169           
=======================================
  Hits         3446     3446           
  Misses       2723     2723           

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