fix: reponse format JSONSchema key fix

[Lucaz0619]

What does this PR do?

This PR fixes openai.BadRequestError 400 - missing required parameter related to response_format.json_schema.schema. The issue was caused by a naming mismatch in JSONSchema parsing when handling response formats. This is a simple fix that ensures proper parameter inclusion.

Before submitting

• [x ] Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• [v] Did you read the contributor guideline, Pull Request section?
• [v] Did you make sure to update the docs?
• Did you write any new necessary tests?

How does this PR impact the user?

✅ Resolves incorrect request failures due to mismatch JSONSchema parameters.

Did you have fun?

Absolutely!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (ccc322a) to head (cfd1d3e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #427   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        31     31           
  Lines      2025   2025           
===================================
+ Hits       1806   1811    +5     
+ Misses      219    214    -5     

[Borda]

Does it happen for and version or just the latest release?