fix(airflow): Update docker.io/apache/airflow Docker tag to v2.8.4

[plural-renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/apache/airflow	final	patch	2.8.2-python3.10 -> 2.8.4-python3.10

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Release Notes

apache/airflow (docker.io/apache/airflow)

v2.8.4

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Significant Changes
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No significant changes.

Bug Fixes
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• Fix incorrect serialization of FixedTimezone (#​38139)
• Fix excessive permission changing for log task handler (#​38164)
• Fix task instances list link (#​38096)
• Fix a bug where scheduler heartrate parameter was not used (#​37992)
• Add padding to prevent grid horizontal scroll overlapping tasks (#​37942)
• Fix hash caching in ObjectStoragePath (#​37769)

Miscellaneous
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• Limit importlib_resources as it breaks pytest_rewrites (#​38095, #​38139)
• Limit pandas to <2.2 (#​37748)
• Bump croniter to fix an issue with 29 Feb cron expressions (#​38198)

Doc Only Changes
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• Tell users what to do if their scanners find issues in the image (#​37652)
• Add a section about debugging in Docker Compose with PyCharm (#​37940)
• Update deferrable docs to clarify kwargs when trigger resumes operator (#​38122)

v2.8.3

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Significant Changes
^^^^^^^^^^^^^^^^^^^

The smtp provider is now pre-installed when you install Airflow. (#​37713)
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Bug Fixes
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• Add "MENU" permission in auth manager (#​37881)
• Fix external_executor_id being overwritten (#​37784)
• Make more MappedOperator members modifiable (#​37828)
• Set parsing context dag_id in dag test command (#​37606)

Miscellaneous
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• Remove useless methods from security manager (#​37889)
• Improve code coverage for TriggerRuleDep (#​37680)
• The SMTP provider is now preinstalled when installing Airflow (#​37713)
• Bump min versions of openapi validators (#​37691)
• Properly include airflow_pre_installed_providers.txt artifact (#​37679)

Doc Only Changes
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• Clarify lack of sync between workers and scheduler (#​37913)
• Simplify some docs around airflow_local_settings (#​37835)
• Add section about local settings configuration (#​37829)
• Fix docs of BranchDayOfWeekOperator (#​37813)
• Write to secrets store is not supported by design (#​37814)
• ERD generating doc improvement (#​37808)
• Update incorrect config value (#​37706)
• Update security model to clarify Connection Editing user's capabilities (#​37688)
• Fix ImportError on examples dags (#​37571)

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