fix: handle non-utf8 bytes in log parser

[nathanbabcock]

Fixes #67

Switch from_utf8 to from_utf8_lossy. Instead of throwing an error when encountering invalid characters, it will insert placeholder error characters instead, e.g.: Apple �T�E���h�E���f�B�A�n���h��.

To try this fix immediately, run this command to add the bugfix branch as a dependency:

cargo add ffmpeg-sidecar --git https://github.com/nathanbabcock/ffmpeg-sidecar.git --branch fix/non-utf8

[nathanbabcock]

CI failure is an unrelated Github Actions issue with DNS resolution on Mac M1, I will try it again later.

0: https://www.osxexperts.net/ffmpeg7arm.zip: Dns Failed: resolve dns name 'www.osxexperts.net:443': failed to lookup address information