Log Message:
cpp-httplib: update to 0.20.0.

    server_certificate_verifier extended to reuse built-in verifier #2064
    Assertion failed when destroying httplib::Client
    #2068
    Spaces incorrectly allowed in header field names #2096
    build(meson): copy MountTest.MultibytesPathName files #2098
    Remove SSLInit #2102
    Add zstd support #2088
    Question the behavior of method read_content_without_length #2109
    Crash when calling std::exit while server running or client requests in \ 
flight #2097