fix Mojolicious min version
To avoid this error:
Mojo::Reactor::EV: I/O watcher failed: Can't locate object method "spew" via package "Mojo::File" at /opt/lufi/script/../lib/Lufi/DB/Slice.pm line 143.
We must use mojolicious version >= 9.34 (cf: https://github.com/mojolicious/mojo/blob/ecb44cf8b1ec11402e28aac1e2a3224d505e95c4/Changes#L26)