update dependencies

nothing interesting

• https://github.com/stefanfoulis/django-phonenumber-field/releases
• https://github.com/python-jsonschema/jsonschema/blob/main/CHANGELOG.rst
• https://github.com/psf/requests/blob/main/HISTORY.md
• https://github.com/fullcalendar/fullcalendar/blob/master/CHANGELOG.md
• https://www.alpinelinux.org/posts/Alpine-3.12.12-3.13.10-3.14.6-3.15.4-released.html