[airflow] fix typos (AIR302, AIR312)

[camper42]

Summary

Fix Airflow Provider package name

apache-airflow-provider-{provider} -> apache-airflow-providers-{provider} (provider -> providers)

with ruff 0.11.6, package name in help msg is not correct, e.g.:

   = help: Install `apache-airflow-provider-standard>=0.0.1` and use `airflow.providers.standard.operators.python.ShortCircuitOperator` instead.

when running uv add apache-airflow-provider-standard, I get:

❯ uv add apache-airflow-provider-standard
  × No solution found when resolving dependencies for split (python_full_version >= '3.13'):
  ╰─▶ Because apache-airflow-provider-standard was not found in the package registry and your project depends on apache-airflow-provider-standard, we can conclude that your project's requirements
      are unsatisfiable.
  help: If you want to add the package regardless of the failed resolution, provide the `--frozen` flag to skip locking and syncing.

correct package name is apache-airflow-providers-standard

ref: https://airflow.apache.org/docs/apache-airflow-providers-standard/stable/index.html

Test Plan

The test fixture has been updated accordingly

[ntBre]

Thanks! @Lee-W does this look good to you?

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[Lee-W]

Yep, thanks for pointing out!