Bump mypy from 1.3.0 to 1.6.0 #1799

Job	Run time
build_test_container	11m 15s
No leftovers	6m 15s
Test on macos-latest	8m 9s
cwltool release test	13m 38s
CWL conformance (v1.0, docker)	3m 39s
Tox (3, 8, lint)	44s
CWL conformance (v1.0, singularity)	3m 57s
Tox (3, 8, unit)	10m 6s
CWL conformance (v1.0, podman)	3m 37s
Linters (lintreadme)	51s
Tox (3, 8, bandit)	37s
CWL conformance (v1.1, docker)	4m 42s
Linters (shellcheck)	20s
Tox (3, 8, mypy)	11m 19s
CWL conformance (v1.1, singularity)	8m 2s
Linters (pydocstyle)	29s
Tox (3, 9, lint)	37s
CWL conformance (v1.1, podman)	6m 17s
Tox (3, 9, unit)	14m 1s
CWL conformance (v1.2, docker)	6m 2s
Tox (3, 9, bandit)	39s
CWL conformance (v1.2, singularity)	8m 56s
Tox (3, 9, mypy)	11m 25s
CWL conformance (v1.2, podman)	7m 2s
Tox (3, 10, lint)	33s
CWL conformance (v1.2, docker, --fast-parser)	6m 19s
Tox (3, 10, unit)	12m 9s
Tox (3, 10, bandit)	35s
Tox (3, 10, mypy)	11m 19s
Tox (3, 11, lint)	38s
Tox (3, 11, unit)	11m 37s
Tox (3, 11, bandit)	39s
Tox (3, 11, mypy)	10m 19s
Tox (3, 12, lint)	1m 1s
Tox (3, 12, unit)	11m 41s
Tox (3, 12, bandit)	51s
Tox (3, 12, mypy)	1m 34s
	3h 31m 54s

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