[AIRFLOW-6400] Fix pytest not working on Windows

[baolsen]

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Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-XXX
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a Jira issue.
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Description

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Pytest wasn't working on Windows as described in JIRA, now it is working.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Minor fix, tested manually on Windows 10. Windows isn't supported anyway so no need to do further detailed testing.

Commits

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  6. Body explains "what" and "why", not "how"

Documentation

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[codecov-io]

Codecov Report

Merging #6964 into master will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6964      +/-   ##
==========================================
- Coverage    84.7%   84.41%   -0.29%     
==========================================
  Files         679      679              
  Lines       38489    38489              
==========================================
- Hits        32601    32491     -110     
- Misses       5888     5998     +110

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/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.75% <0%> (-20%)	⬇️

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[potiuk]

Thanks @baolsen !