/usr/lib/x86_64-linux-gnu/libxml-security-c.so is in libxml-security-c-dev 1.7.2-3+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxml-security-c.so.17.0.2
/usr/lib/x86_64-linux-gnu/libxml-security-c.so.17.0.2