New release: Version 1.9

[pyxel-detector-framework]

Dear Pyxel users,

The Pyxel version 1.9 is released.

This release brings a number of bugfixes and documentation improvements.

`Detector` contains a new bucket `data` which contains a `xarray.DataTree`.

In the model group `Data processing`, two new models have been added, 

namely ``mean_variance`` and ``linear_regression`` and the model ``statistics`` has been improved.

Calibration mode was improved for the usage of the function`run_mode`.

Support for Python 3.8 has been dropped and support for Python 3.11 has been added.

The minimum versions of some dependencies were changed.

See more details and changes in the changelog.