[airflow] Convert DatasetOrTimeSchedule(datasets=...) to AssetOrTimeSchedule(assets=...) (AIR311)

[Lee-W]

Summary

update the argument datasets as assets

Test Plan

update fixture accordingly

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+3 -0 violations, +0 -0 fixes in 1 projects; 54 projects unchanged)

apache/airflow (+3 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --no-fix --output-format concise --preview --select ALL

+ providers/openlineage/tests/system/openlineage/example_openlineage_schedule_asset_or_time_dag.py:53:9: AIR311 [*] `datasets` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.
+ providers/openlineage/tests/unit/openlineage/plugins/test_utils.py:683:13: AIR311 [*] `datasets` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.
+ providers/openlineage/tests/unit/openlineage/utils/test_utils.py:1242:17: AIR311 [*] `datasets` is removed in Airflow 3.0; It still works in Airflow 3.0 but is expected to be removed in a future version.

Changes by rule (1 rules affected)

code	total	+ violation	- violation	+ fix	- fix
AIR311	3	3	0	0	0

[ntBre]

Thanks!