Remove deprecated apply_default decorator from HexOperator

Description

When using the airflow_provider_hex package, the following deprecation warning is being generated:

[2024-09-07T13:43:27.523+0000] {logging_mixin.py:188} WARNING - /usr/local/airflow/.local/lib/python3.11/site-packages/airflow_provider_hex/operators/hex.py:11 RemovedInAirflow3Warning: This decorator is deprecated.

In previous versions, all subclasses of BaseOperator must use apply_default decorator for the `default_args` feature to work properly.

In current version, it is optional. The decorator is applied automatically using the metaclass.

This warning indicates that the apply_default decorator used in the HexOperator class (located in /usr/local/airflow/.local/lib/python3.11/site-packages/airflow_provider_hex/operators/hex.py at line 11) is deprecated and no longer necessary in the current version of Airflow.

Expected Behavior

The HexRunProjectOperator should not use the deprecated apply_default decorator, as it's now automatically applied by the metaclass in Airflow.

Proposed Solution

Remove the @apply_default decorator from the HexOperator class in the hex.py file.

Steps to Reproduce

1. Install the airflow_provider_hex package
2. Use the HexRunProjectOperator in an Airflow DAG
3. Run the DAG or perform a task that involves the HexOperator
4. Observe the deprecation warning in the logs