[AIRFLOW-XXXX] Fix typo in tests/jobs/test_base_job.py

[kaxil]

Fix typo in tests/jobs/test_base_job.py

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Issue link: Document only change, no JIRA issue

Make sure to mark the boxes below before creating PR: [x]

• Description above provides context of the change
• Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• Unit tests coverage for changes (not needed for documentation changes)
• Commits follow "How to write a good git commit message"
• Relevant documentation is updated including usage instructions.
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^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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In case of backwards incompatible changes please leave a note in UPDATING.md.
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[codecov-io]

Codecov Report

Merging #7698 into master will decrease coverage by 0.27%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7698      +/-   ##
==========================================
- Coverage   86.98%   86.71%   -0.28%     
==========================================
  Files         904      904              
  Lines       43736    43736              
==========================================
- Hits        38045    37926     -119     
- Misses       5691     5810     +119     

Impacted Files	Coverage Δ
airflow/kubernetes/volume_mount.py	44.44% <0.00%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0.00%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	47.18% <0.00%> (-45.08%)	⬇️
...viders/cncf/kubernetes/operators/kubernetes_pod.py	69.69% <0.00%> (-25.26%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0.00%> (-23.53%)	⬇️

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