move BaseOperator to airflow.sdk

Author: sjyangkevin

crates/ruff_linter/src/rules/airflow/rules/removal_in_3_1.rs

@@ -168,7 +168,7 @@ fn check_name(checker: &Checker, expr: &Expr, range: TextRange) {
         },
         // airflow.models.baseoperator
         ["airflow", "models", "baseoperator", "BaseOperator"] => Replacement::SourceModuleMoved {
-            module: "airflow.sdk.bases.operator",
+            module: "airflow.sdk",
             name: "BaseOperator".to_string(),
         },
         // airflow.macros

crates/ruff_linter/src/rules/airflow/snapshots/ruff_linter__rules__airflow__tests__AIR321_AIR321_names.py.snap

@@ -379,12 +379,12 @@ AIR321 [*] `airflow.models.baseoperator.BaseOperator` is removed in Airflow 3.1
 68 |
 69 | # airflow.macros
    |
-help: Use `BaseOperator` from `airflow.sdk.bases.operator` instead.
+help: Use `BaseOperator` from `airflow.sdk` instead.
 62 | TaskStateChangeCallback()
 63 | 
 64 | # airflow.models.baseoperator
    - from airflow.models.baseoperator import BaseOperator
-65 + from airflow.sdk.bases.operator import BaseOperator
+65 + from airflow.sdk import BaseOperator
 66 | 
 67 | BaseOperator()
 68 |