[AIRFLOW-6479] Update celery command calls

[mik-laj]

Follow up: https://github.com/apache/airflow/pull/6877/files

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Link to JIRA issue: https://issues.apache.org/jira/browse/AIRFLOW-6479

• Description above provides context of the change
• Commit message starts with [AIRFLOW-NNNN], where 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.
• I will engage committers as explained in Contribution Workflow Example.

(*) For document-only changes, no JIRA issue is needed. Commit message starts [AIRFLOW-XXXX].

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.
Read the Pull Request Guidelines for more information.

[codecov-io]

Codecov Report

Merging #7068 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7068      +/-   ##
==========================================
- Coverage   85.01%   84.85%   -0.16%     
==========================================
  Files         680      680              
  Lines       38748    38952     +204     
==========================================
+ Hits        32942    33054     +112     
- Misses       5806     5898      +92

Impacted Files	Coverage Δ
airflow/executors/celery_executor.py	88.43% <ø> (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	78.75% <0%> (-20%)	⬇️
airflow/utils/log/file_processor_handler.py	85.33% <0%> (-2.67%)	⬇️
airflow/jobs/backfill_job.py	90.72% <0%> (-1.16%)	⬇️
airflow/jobs/local_task_job.py	89.74% <0%> (+0.41%)	⬆️
airflow/gcp/hooks/bigquery.py	90.71% <0%> (+2.36%)	⬆️
... and 1 more

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