drop EOL python 3.7 so we can upgrade coverage #126

Job	Run time
Mypy (static type checker)	41s
Build documentation	47s
Linters	1m 4s
Documentation link check	43s
Packaging	30s
Py:3.8 - Tw:21.2 - ubuntu-latest	1m 4s
Py:3.8 - Tw:22.1 - ubuntu-latest	1m 0s
Py:3.8 - Tw:current - ubuntu-latest	1m 18s
Py:3.9 - Tw:21.2 - ubuntu-latest	1m 17s
Py:3.9 - Tw:22.1 - ubuntu-latest	1m 14s
Py:3.9 - Tw:current - ubuntu-latest	1m 13s
Py:3.10 - Tw:21.2 - ubuntu-latest	1m 22s
Py:3.10 - Tw:22.1 - ubuntu-latest	1m 12s
Py:3.10 - Tw:current - ubuntu-latest	1m 10s
Py:3.11 - Tw:21.2 - ubuntu-latest	1m 18s
Py:3.11 - Tw:22.1 - ubuntu-latest	1m 15s
Py:3.11 - Tw:current - ubuntu-latest	57s
Py:3.12 - Tw:21.2 - ubuntu-latest	2m 6s
Py:3.12 - Tw:22.1 - ubuntu-latest	1m 58s
Py:3.12 - Tw:current - ubuntu-latest	2m 27s
Py:pypy-3.8 - Tw:current - ubuntu-latest	1m 8s
Py:pypy-3.9 - Tw:current - ubuntu-latest	2m 5s
dbxs-required	2s
	27m 51s

Provide feedback