fix: Move docling dependency into core dependencies instead of dev

[erichare]

This pull request updates the dependencies in pyproject.toml to use the correct package name for docling in both the main and development dependency lists.

Dependency updates:

• Changed the main dependency from docling_core to docling to ensure the correct package is installed.
• Removed the duplicate docling entry from the development dependencies to avoid redundancy.

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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

[Cristhianzl]

lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.77%. Comparing base (75f34b3) to head (7b815eb).
⚠️ Report is 3 commits behind head on release-1.6.0.

❌ Your project status has failed because the head coverage (8.84%) is below the target coverage (10.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.6.0    #9906      +/-   ##
=================================================
+ Coverage          35.76%   35.77%   +0.01%     
=================================================
  Files               1218     1218              
  Lines              58112    58112              
  Branches            5524     5524              
=================================================
+ Hits               20781    20789       +8     
+ Misses             37170    37162       -8     
  Partials             161      161              

Flag	Coverage Δ
backend	55.66% <ø> (+0.02%)	⬆️

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see 7 files with indirect coverage changes

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