Tomtoolkit

This release fixes the issues updating cadences for the photometric and spectroscopic sequence forms.

This release fixes the following:

- Completes the upgrade to the ALeRCE v1 API.
- Updates the TNS API URL to the updated value.
- Adds ``DEFAULT_AUTO_FIELD`` to ``settings.tmpl`` for new TOMs. Existing TOMs should add ``DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'`` to their ``settings.py``, which will resolve any warning messages that include ``HINT: Configure the DEFAULT_AUTO_FIELD setting``, provided the existing TOM is on Django 3.2 or later.

This release removes the MPC module as a default, given that the latest version of astroquery has an issue with it that will be fixed in the next release.

Users of the MPC should follow the instructions listed [here](https://tom-toolkit.readthedocs.io/en/stable/api/tom_catalogs/harvesters.html#minor-planet-center) in order to ensure that it works.

This release includes most, but not all, of the upgrade to the new ALeRCE API. It should be considered to be in beta as long as the disclaimer at the top of the ALeRCE query form is present.

This release supercedes the mistaken 2.6.1 release and includes the fix for spectroscopic migration alluded to in 2.6.1. It also includes a stub module for the Fink broker.