/usr/lib/x86_64-linux-gnu/libespeak.so is in libespeak-dev 1.48.04+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libespeak.so.1.1.48
/usr/lib/x86_64-linux-gnu/libespeak.so.1.1.48