bump curl to 8.21.0

[MrScriptX]

Bump curl to 8.21.0

Summary by CodeRabbit

• Updates

  • Updated the bundled cURL version to 8.21.0.
  • Refreshed cURL integration with updated networking, DNS, security, proxy, and connection-handling components.
  • Improved compatibility with current cURL protocol and transport implementations.

• Documentation

  • Updated the README’s listed cURL version and source reference to reflect the newer release.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 494b6f51-16ae-433f-b10f-c74ecffbfd07

📥 Commits

Reviewing files that changed from the base of the PR and between 92291f0 and d93e78d.

📒 Files selected for processing (1)

• libs/curl.zig

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The PR updates the vendored libcurl reference from 8.19.0 to 8.21.0. It updates the dependency URL and hash, and adjusts the C source compilation list for renamed, removed, and added libcurl sources.

Changes

libcurl 8.21.0 update

Layer / File(s)	Summary
Update libcurl dependency metadata README.org, build.zig.zon	The documented version, download URL, repository tag, and package hash now reference libcurl 8.21.0.
Align the curl source compilation list libs/curl.zig	The source list removes obsolete files, renames QUIC sources, and adds DNS, protocol, connection-filter, credential, peer, receive-buffer, proxy, and TLS configuration sources.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to d93e7

This update only bumps the curl version and introduces no actionable merge-blocking risk beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the curl dependency to version 8.21.0.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[MrScriptX]

I'll fix the PR tomorrow

[jiacai2050]

let me know when it's ready for review