docs: remove redundant header from blog post

[JP-Ellis]

📝 Summary

There was some redundancy with the content type being specified twice, when it isn't really required.

🚨 Breaking Changes

🔥 Motivation

🔨 Test Plan

🔗 Related issues/PRs

[Copilot]

Pull request overview

This PR removes a redundant Content-Type header specification from a code example in the Pact Python v3 release blog post. The Content-Type is already being set via the content_type parameter in the with_body() method, making the explicit header declaration unnecessary.

Key Changes

• Removed duplicate Content-Type header declaration from code example

Comments suppressed due to low confidence (1)

docs/blog/posts/2025/12-04 pact-python-v3-release.md:1

• The blog post filename and content reference December 4, 2025, which is a future date. Since the current date is December 4, 2025, this appears to be published today. Verify this is intentional and the content is ready for publication.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51%. Comparing base (8bd7657) to head (4062d41).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1385   +/-   ##
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  Coverage    51%     51%           
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  Files        31      31           
  Lines      3729    3729           
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  Hits       1938    1938           
  Misses     1791    1791           

Flag	Coverage Δ
tests	51% <ø> (ø)

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