fix: libxml2 related deprecated issues in v3 - #3455

'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [C:\Users\runneradmin\.conan2\p\b\poco39b470ace4dc1\b\build\NetSSL_OpenSSL\NetSSL.vcxproj]

'argument': conversion from 'std::streamoff' to 'DWORD', possible loss of data [C:\Users\runneradmin\.conan2\p\b\poco39b470ace4dc1\b\build\Net\Net.vcxproj]

'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [C:\Users\runneradmin\.conan2\p\b\poco39b470ace4dc1\b\build\Data\PostgreSQL\DataPostgreSQL.vcxproj]