/usr/lib/x86_64-linux-gnu/libespeak-ng.so is in libespeak-ng-dev 1.49.2+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libespeak-ng.so.1.1.49
/usr/lib/x86_64-linux-gnu/libespeak-ng.so.1.1.49