Update libcurl to 8.20.0

[Lpsd]

Summary

Updates curl vendor to 8.20.0 -> https://github.com/curl/curl/releases/tag/curl-8_20_0

Removes a bunch of unnecessary files, we only care about lib and include folders.

Motivation

Keeping it fresh 🥦

Test plan

Test resource: curl.zip
Start it for instructions, basic commands to run tests on httpbin.org via fetchRemote
All tests pass

Checklist

• Your code should follow the coding guidelines.
• Smaller pull requests are easier to review. If your pull request is beefy, your pull request should be reviewable commit-by-commit.