ci: Run mypy on all CPython versions #386

Job	Run time
matrix-builder	12s
Skipping on Python 3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	17s
Skipping on Python 3.12 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	18s
Test on Python 3.7 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 19s
Test on Python 3.7 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 9s
Test on Python 3.8 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 17s
Test on Python 3.8 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 12s
Test on Python 3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 10s
Test on Python 3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 18s
Test on Python 3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 18s
Test on Python 3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 18s
Test on Python 3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 13s
Test on Python 3.12 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 32s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 39s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 33s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 37s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	3m 10s
	21m 32s

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