Update Fermi Catalog and adapt feature name in plotting function

[azegarelli]

Hi,

After the release of a new catalog by Fermi (https://fermi.gsfc.nasa.gov/ssc/data/access/lat/fl16y/), and after discussion among the Real-time group and ROC (@blaufuss ), we would like to change the catalog name in skyreader/constants.py..
In this way, the new FIT file (stored in /cvmfs/icecube.opensciencegrid.org/users/azegarelli/realtime/catalogs) is used to produce zoomed plots around the track-alert reconstructions with Skymist.

Consequently, I propose to change here plot_4fgl to plot_fermi_sources, to make the boolean more general to the usage of every Fermi catalog name that can be changed in skyreader/constants.py..
This implies also a similar change in SkyMist (see the following pull request https://github.com/icecube/skymist/pull/272)

We take profit of this merge request, to fix a failing check for mypy(>=3.11), appeared after January 2026 (

skyreader/skyreader/utils/handle_map_data.py

Lines 334 to 337 in 71de863

	already_filled_uniqs_array = np.concatenate(already_filled_uniqs)
	already_filled_indeces = np.array(
	[np.where(uniqs == uni)[0][0] for uni in already_filled_uniqs_array]
	)

)

[azegarelli]

I forgot to mention that I have already tested that the current plotting functions work for the new catalog

This is the plot for the last track alert

As you can see, the F16Y sources are now overplotted.

Just for comparison, this was the plot produced at the time of the alert with the Fermi 4FGL catalog

[blaufuss]

thanks @azegarelli