[AIRFLOW-5836] Pin azure-storage-blob version to <12

[mik-laj]

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Tests

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[feluelle]

I restarted the failed check.

It was failing due to:

  Traceback (most recent call last):

    /usr/local/lib/python3.5/unittest/mock.py line 1159 in patched

      return func(*args, **keywargs)

    tests/jobs/test_local_task_job.py line 161 in test_heartbeat_failed_fast

      self.assertGreaterEqual((time2 - time1).total_seconds(), job.heartrate)

   AssertionError: 1.998126 not greater than or equal to 2

(another flaky test :/)

[codecov-io]

Codecov Report

Merging #6486 into master will decrease coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6486      +/-   ##
==========================================
- Coverage   83.96%   83.65%   -0.32%     
==========================================
  Files         635      635              
  Lines       36657    36657              
==========================================
- Hits        30780    30666     -114     
- Misses       5877     5991     +114

Impacted Files	Coverage Δ
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/kube_client.py	33.33% <0%> (-41.67%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	70.14% <0%> (-28.36%)	⬇️
airflow/models/taskinstance.py	93.28% <0%> (-0.51%)	⬇️

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[feluelle]

Since this is a temporarily solution there is the Jira Ticket to remove this extra dependency once the issue is solved. See https://issues.apache.org/jira/browse/AIRFLOW-5837 for more information.