Throughput tests are failing with the ctapipe 0.20.0

Summary

EventSource.from_config() has been removed, see ctapipe #2258.

For some reason, it has been used in throughput calibrator.

2023-09-12 12:59:48,425 ERROR [calibpipe.calibpipe-throughput-calibration] (tool.run): Caught unexpected exception: type object 'EventSource' has no attribute 'from_config'
Traceback (most recent call last):
  File "/root/micromamba/envs/cta-dev/lib/python3.9/site-packages/ctapipe/core/tool.py", line 414, in run
    self.setup()
  File "/root/micromamba/envs/cta-dev/lib/python3.9/site-packages/calibpipe/tools/throughput_calibrator.py", line 76, in setup
    self.eventsource = EventSource.from_config(parent=self)
AttributeError: type object 'EventSource' has no attribute 'from_config'

Steps to reproduce

Relaunch tests in the CI.

What is the expected correct behavior?

EventSource.from_config() shall not be used.

Relevant logs and/or screenshots

See e.g. https://gitlab.cta-observatory.org/cta-computing/dpps/calibrationpipeline/calibpipe/-/jobs/131842

Environment

• Version used: py3.9, 3.10
• Operation System: almalinux 9

Max from ctapipe #2258:

EventSource.from_config is not needed anymore (and since quite some time), since EventSource(parent=self) "just works™".