fix the pickling error for IO objects #1858

Job	Run time
No leftovers	4m 47s
Linters (lintreadme)	1m 20s
Tox (3, 8, lint)	41s
Linters (shellcheck)	38s
Tox (3, 8, unit)	12m 19s
build_test_container	11m 3s
Linters (pydocstyle)	38s
Tox (3, 8, bandit)	41s
Tox (3, 8, mypy)	12m 57s
CWL conformance (v1.0, docker)	5m 41s
Tox (3, 9, lint)	34s
Test on macos-latest	9m 5s
CWL conformance (v1.0, singularity)	5m 3s
Tox (3, 9, unit)	10m 2s
CWL conformance (v1.0, podman)	5m 32s
Tox (3, 9, bandit)	39s
cwltool release test	19m 41s
Tox (3, 9, mypy)	11m 2s
CWL conformance (v1.1, docker)	9m 22s
Tox (3, 10, lint)	49s
CWL conformance (v1.1, singularity)	11m 1s
Tox (3, 10, unit)	10m 43s
CWL conformance (v1.1, podman)	7m 51s
Tox (3, 10, bandit)	35s
CWL conformance (v1.2, docker)	10m 40s
Tox (3, 10, mypy)	13m 31s
CWL conformance (v1.2, singularity)	15m 29s
Tox (3, 11, lint)	35s
CWL conformance (v1.2, podman)	13m 13s
Tox (3, 11, unit)	9m 23s
CWL conformance (v1.2, docker, --fast-parser)	12m 36s
Tox (3, 11, bandit)	36s
Tox (3, 11, mypy)	12m 4s
Tox (3, 12, lint)	51s
Tox (3, 12, unit)	11m 37s
Tox (3, 12, bandit)	49s
Tox (3, 12, mypy)	11m 6s
	4h 25m 14s

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