ENH: Updating AirNow API for new API calls and returns

[AdamTheisen]

What changed

Updated AirNow API call funds

Why

AirNow API calls are changing Sep 30, with some being retired and new returns to others.

Issues closed

Closes #1024

Validation

Mark each item as done or N/A. Add one short evidence line for each item.

• I ran pre-commit or ruff

• I ran tests and/or added tests

AI usage & manual verification

If AI tools were used, complete this section.

• AI used: yes
• Model/tooling:ChatGPT
• Tasks delegated to AI: Used AI to help update the existing functions, had it update the example, and help troubleshoot the unit test failures.
• Manual verification performed: Manual verification performed with unit tests, minimal modification, and ensuring example plot was the same.

Use Xarray Dataset naming

When adding dataset usage to the code use ds for Datasets and da for
DataArrays