fix: send Content-Type: application/json when calling inference service

[JiriPapousek]

Additional Context

Add Content-Type: application/json to upgrades-inference requests, since the header became required by default with move to newer version of FastAPI. This is blocking automatic version bump in RedHatInsights/ccx-upgrades-inference#22

Explanation from Claude:

FastAPI 0.133.1 (with newer starlette) is stricter about requiring Content-Type: application/json for JSON body parsing

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Bump-up dependent library (no changes in the code)

Testing steps

NA

Checklist

• pre-commit run --all passes
• updated documentation wherever necessary
• added or modified tests if necessary
• updated schemas and validators in insights-data-schemas in case of input/output change

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Cache: Disabled due to data retention organization setting

Knowledge base: Disabled due to Reviews -> Disable Knowledge Base setting

📥 Commits

Reviewing files that changed from the base of the PR and between 79e70b6 and cdf373e.

📒 Files selected for processing (1)

• ccx_upgrades_data_eng/inference.py

🚧 Files skipped from review as they are similar to previous changes (1)

• ccx_upgrades_data_eng/inference.py

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Summary by CodeRabbit

Release Notes

• Refactor
  • Improved how inference requests serialize and send JSON payloads, switching to a native JSON structure for more reliable transmission. No changes to request method, timeouts, status handling, or downstream processing—behavior remains consistent while reducing serialization fragility.

Walkthrough

Modified the inference request to send a JSON-serializable dictionary via json=risk_predictors.model_dump() instead of a pre-stringified payload data=risk_predictors.json(), preserving HTTP method, timeout, and downstream status handling.

Changes

Cohort / File(s)	Summary
Inference Request Serialization ccx_upgrades_data_eng/inference.py	Replaced data=risk_predictors.json() with json=risk_predictors.model_dump() to send a JSON-serializable dictionary payload instead of a JSON string.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding Content-Type: application/json header to inference service requests.
Description check	✅ Passed	The description covers required template sections including Additional Context, Type of change, and Testing steps with clear explanations.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@ccx_upgrades_data_eng/inference.py`:
- Line 29: The requests.get call assigned to inference_response is misformatted
for Black; reformat the call to requests.get(inference_endpoint,
json=risk_predictors.model_dump(), timeout=5) by breaking arguments onto
separate lines (one argument per line and trailing comma) so Black will accept
it — locate the call using the inference_response variable name and the
requests.get invocation with inference_endpoint and risk_predictors.model_dump()
and update its formatting accordingly.

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ℹ️ Review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Cache: Disabled due to data retention organization setting

Knowledge base: Disabled due to Reviews -> Disable Knowledge Base setting

📥 Commits

Reviewing files that changed from the base of the PR and between ee18e92 and 79e70b6.

📒 Files selected for processing (1)

• ccx_upgrades_data_eng/inference.py