curl_cffi bundles a version of libcurl affected by High Severity vulnerability

Summary

### Summary curl_cffi is potentially affected by High Severity vulnerability (CVE-2023-38545) in libcurl<8.4.0 ### Details HIGH severity vulnerability in curl and libcurl: [announcement](https://github.com/curl/curl/discussions/12026#discussioncomment-7195548) Details are still unknown, but seems it will be a major issue as it's advertised by curl devs as "_probably the worst curl security flaw in a long time_". A patched version (8.4.0) and details will be published around 06:00 UTC on October 11. curl_cffi wheels on PyPI ship with libcurl 7.84.0 ### PoC [https://inspector.pypi.io/project/curl-cffi/0.5.10b2/packages/56/ae/eb7d39ad234f1f44650b910757d5aa696feff413d327c8328223ce78cb76/curl_cffi-0.5.10b2-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl/curl_cffi/include/curl/curlver.h](https://inspector.pypi.io/project/curl-cffi/0.5.10b2/packages/56/ae/eb7d39ad234f1f44650b910757d5aa696feff413d327c8328223ce78cb76/curl_cffi-0.5.10b2-cp37-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl/curl_cffi/include/curl/curlver.h) ### Resolution Versions after 0.7 bundles with `libcurl>=8.5`, which is not affected by this issue.