- Update to 1.9.0
## General
* The minimum required Python is now 3.9. [#1569]
* The minimum required NumPy is now 1.22. [#1572]
## New Features
### photutils.background
* Added LocalBackground class for computing local backgrounds in
a circular annulus aperture. [#1556]
### photutils.datasets
* Added new make_test_psf_data function. [#1558, #1582, #1585]
### photutils.psf
* Propagate measurement uncertainties in PSF fitting. [#1543]
* Added new PSFPhotometry and IterativePSFPhotometry classes for
performing PSF-fitting photometry. [#1558, #1559, #1563, #1566,
#1567, #1581, #1586, #1590, #1594, #1603, #1604]
* Added a new SourceGrouper class. [#1558, #1605]
* Added a GriddedPSFModel fill_value attribute. [#1583]
* Added a grid_from_epsfs function to make a GriddedPSFModel from
ePSFs. [#1596]
* Added a read method to GriddedPSFModel for reading “STDPSF”
FITS files containing grids of ePSF models. [#1557]
* Added a plot_grid method to GriddedPSFModel for plotting ePSF
grids. [#1557]
* Added a STDPSFGrid class for reading “STDPSF” FITS files
containing grids of ePSF models and plotting the ePSF grids.
[#1557]
## Bug Fixes
### photutils.aperture
* Fixed a bug in the validation of PixelAperture positions.
[#1553]