[AIRFLOW-6063] Remove astroid dependency

[feluelle]

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Description

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The issue pylint-dev/pylint#3123 has been fixed. So we can remove this dependency from our setup.py.

Tests

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Documentation

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[codecov-io]

Codecov Report

Merging #6659 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #6659      +/-   ##
=========================================
- Coverage   83.76%   83.5%   -0.26%     
=========================================
  Files         672     672              
  Lines       37584   37585       +1     
=========================================
- Hits        31482   31387      -95     
- Misses       6102    6198      +96

Impacted Files	Coverage Δ
airflow/operators/mysql_operator.py	100% <0%> (ø)	⬆️
airflow/operators/mysql_to_hive.py	100% <0%> (ø)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.2% <0%> (-20.52%)	⬇️
airflow/utils/sqlalchemy.py	93.22% <0%> (+1.69%)	⬆️
airflow/configuration.py	89.13% <0%> (-3.63%)	⬇️
airflow/hooks/hive_hooks.py	77.6% <0%> (ø)	⬆️
... and 6 more

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[potiuk]

I think we can also remove the pylint limit below (same reason) and then we can finally disable module-level docstrings :)

[feluelle]

I would like to create a separate PR for that due to a huge amount of changes when upgrading pylint to >= 2.4

[potiuk]

OK then :).