[Library] Bump httplib to 0.11.2

[Akkadius]

Changes

• CPPHTTPLIB_NO_DEFAULT_USER_AGENT skips default user agent (CPPHTTPLIB_NO_DEFAULT_USER_AGENT skips default user agent yhirose/cpp-httplib#1201)
• Add optional private key password to SSLServer ctor (Add optional private key password to SSLServer ctor yhirose/cpp-httplib#1205)
• Upload unicode file name bug (upload unicode file name bug yhirose/cpp-httplib#1212)
• Skipping fragment string on server (URL match problem yhirose/cpp-httplib#1214, #1214 The bug is not fixed yhirose/cpp-httplib#1215)
• BindIPAddress when force address family to IPV6 and set outbound interface (BindIPAddress when force address family to IPV6 and set outbound interface yhirose/cpp-httplib#1235)
• Accept large data transfer over SSL (Accept large data transfer over SSL yhirose/cpp-httplib#1261)
• Http server can't send file large than 2GB (http server can't provide zip file large than 2GB with project both defined _WIN32 and _WIN64 yhirose/cpp-httplib#1290)
• LeakSanitizer: Memory leak in hosted_at (LeakSanitizer: Memory leak in hosted_at yhirose/cpp-httplib#1303)
• Skip preamble and epilogue in multipart/form-data (Fix class MultipartFormDataParser cannot handle content starts with 2 CRLF yhirose/cpp-httplib#1317)
• No longer support VS 2013 and older
• Changed to use std::exception_ptr in exception handler
• Changed to use const std::string & as much as possible instead of const char *
• Issue 49512: cpp-httplib:server_fuzzer: Timeout in server_fuzzer
• Add socket method to Client (Add get_socket_fd method to Client and ClientImpl, add according unit… yhirose/cpp-httplib#1341)
• UNIX domain socket support (UNIX domain socket support yhirose/cpp-httplib#1346)
• Add multipart form-data for PUT requests. (add multipart formdata for PUT requests. yhirose/cpp-httplib#1351)
• Issue 49740 in oss-fuzz: cpp-httplib:server_fuzzer: Timeout in server_fuzzer
• build: set soversion to major.minor (build: set soversion to major.minor yhirose/cpp-httplib#1357)
• Detecting client disconnection (Detecting client disconnection yhirose/cpp-httplib#1373)
• Fix is_file problem on Windows (Fix is_file problem on Windows yhirose/cpp-httplib#1153)
• fix socket option setting for windows (fix socket option setting for windows yhirose/cpp-httplib#1154)
• Fix "opaque" is missing. yhirose/cpp-httplib#1166
• Report connection timeout as separate event (Report connection timeout as separate event yhirose/cpp-httplib#1171)
• Add SSLServer::ssl_context()
• Performance improvement for multipart form data file upload
• Fix keep-alive problem
• Add CPPHTTPLIB_LISTEN_BACKLOG
• Can't properly stop server when using huge max keep alives (Can't properly stop server when using huge max keep alives yhirose/cpp-httplib#1121)