vendor : update cpp-httplib to 0.45.1

[cabelo]

Overview

Additional information

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: NO

What's Changed

v0.45.1

Bug fixes

• Fix iOS build break caused by TARGET_OS_MAC being true on all Apple platforms (iOS, tvOS, watchOS). The Keychain enumeration path and Security.h include guards are now narrowed to TARGET_OS_OSX, and defining CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN on a non-macOS Apple platform now emits an explicit #error directing users to set_ca_cert_path() with a bundled CA file.
• Fix zstd detection in the installed httplibConfig.cmake so downstream projects that depend on the installed package correctly pick up zstd

Improvements

• Replace the deprecated SecTrustCopyAnchorCertificates (deprecated in macOS 13) with SecTrustSettingsCopyCertificates, iterating over the System, Admin, and User trust domains to retain equivalent anchor-certificate coverage
• Declare Server::stop() as noexcept, reflecting that the implementation does not throw