Update Argos Translate to v1.9.4

[PJ-Finlay]

This fixes an issue in SentencePiece where the packaging is broken for newer versions of Python.

argosopentech/argos-translate#405

[PJ-Finlay]

The "install dependencies" CI failed. I'm guessing this is just because I made this pull request too quickly after pushing to PyPI.

Installing project in development mode
ERROR: Could not find a version that satisfies the requirement argostranslate==1.9.4 (from libretranslate) (from versions: 1.0, 1.0.3, 1.0.5, 1.0.6, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.6.0, 1.6.1, 1.7.0, 1.7.2, 1.7.3, 1.7.4, 1.7.5, 1.8.0, 1.8.1, 1.8.2, 1.8.3, 1.9.0, 1.9.1, 1.9.2, 1.9.3)
ERROR: No matching distribution found for argostranslate==1.9.4
Error: Process completed with exit code 1.

1.9.4 should be a valid version on PyPI now though:
https://pypi.org/project/argostranslate/1.9.4/

[PJ-Finlay]

Yep, I retriggered the CI and it passed