third_party: update libcurl from 8.5.0 to 8.7.1

[ligurio]

    
    The patch updates curl module to the version 8.7.1 [1][2] that
    brings a number of functional and security fixes, and updates
    CMake module for building curl library.
    
    Security fixes:
    
    - CVE-2024-2004: Usage of disabled protocol. (low)
    - CVE-2024-2398: HTTP/2 push headers memory-leak. (medium)
    - CVE-2024-2379: QUIC certificate check bypass with wolfSSL. (low)
    - CVE-2024-2466: TLS certificate check bypass with mbedTLS. (medium)
    
    Changes in CMake module:
    
    - Option `USE_OPENSSL_QUIC` was added and disabled by default [3]
    
    Changelog entry has been removed because duplicate entries about
    bumps confuses end users.
    
    1. https://curl.se/changes.html#8_7_1
    2. https://github.com/curl/curl/compare/curl-8_6_0...curl-8_7_1
    3. https://github.com/curl/curl/commit/8e741644a229c3791963b4f5cae1dcfccba842dd

    third_party: update libcurl from 8.5.0+patch to 8.6.0
    
    The patch updates curl module to the version 8.6.0 [1][2] that brings a
    number of functional fixes, and updates CMake module for building curl
    library.
    
    Changes in CMake module:
    
    - Option `ENABLE_CURL_MANUAL` was added and disabled by default [3]
    - Option `BUILD_LIBCURL_DOCS` was added and disabled by default [3]
    
    The patch follows up commit 9bdf2bab97d4 ("httpc: fix reading data in a
    chunked request") where curl submodule was updated to a version based on
    8.5.0 release with applied patch with fix [5].
    
    Changelog entry has been removed because duplicate entries about bumps
    confuses end users.
    
    1. https://curl.se/changes.html#8_6_0
    2. https://github.com/curl/curl/compare/curl-8_5_0...curl-8_6_0
    3. https://github.com/curl/curl/commit/a808aab06851d4364ab1773c664df3d906a497a9
    5. https://github.com/curl/curl/commit/cdd905a9854305657ebbe645095e1189dcda28c7

[coveralls]

coverage: 87.012% (-0.03%) from 87.037%
when pulling 7275216 on ligurio/bump-curl-8.6.0
into ff7d8f0
on master.