The setup-python action is able to cache the dependencies and reuse this
cache while the pyproject file has not changed. It is easy to setup,
just the package manager used has to be declared in the cache settings.
When we were executing the crowdin_upload workflow,
we were not building the mail template to dispatch it
to the backend. It resulted in the mail not being
totally translated. This commit fixes that issue
by adding the build mail step to the crowdin_upload.
To do so, we added it to the dependencies workflow.
"dependencies" workflow is callable by other
workflows that need a specific job.