Update Airflow to 2.2.4

[AetherUnbound]

Description

This PR updates Airflow to the latest version, v2.2.4. Unfortunately, this version does not yet support Python 3.10 (although that's happening soon! See: apache/airflow#19059).

I've moved the Airflow version to an argument at the top of the Airflow installation section - this should make it easier to find and update the version, rather than hunting through the Dockerfile to try and find it.

This also fixes some deprecations warnings regarding Airflow that were appearing in the test output.

Testing Instructions

1. just build
2. just test
3. Run a DAG and verify that it works!

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

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Developer's Certificate of Origin 1.1

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[zackkrida]

It's great that the changes necessary here are so minimal. The new Airflow arg for the version is a nice improvement.

[AetherUnbound]

The label check action hates when I submit a PR from the GitHub CLI 🙈

[AetherUnbound]

I do not understand... @dhruvkb do you have any idea what's going on here? The labels are correct but the check is still failing 🤔 Same with this PR! WordPress/openverse-api#530

[zackkrida]

@AetherUnbound that's super weird! I tried re-running the action manually and it still failed! Removing and re-applying the labels in the GitHub UI seemed to fix it, however.

[stacimc]

Looks great 🎉