Merge pull request #312 from loichuder/ensure-json-closed #472

Job	Run time
test (ubuntu-20.04, 3.9, PyQt5~=5.12.0)	1m 35s
test (ubuntu-20.04, 3.9, PyQt5~=5.14.0)	1m 45s
test (ubuntu-20.04, 3.10, PyQt5~=5.15.0)	1m 39s
test (ubuntu-20.04, 3.11, PyQt5~=5.15.0)	1m 41s
test (ubuntu-20.04, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	1m 35s
test (ubuntu-22.04, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	1m 20s
test (ubuntu-22.04, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	1m 19s
test (macos-12, 3.9, PyQt5~=5.12.0)	1m 12s
test (macos-12, 3.9, PyQt5~=5.14.0)	1m 21s
test (macos-12, 3.10, PyQt5~=5.15.0)	1m 9s
test (macos-13, 3.11, PyQt5~=5.15.0)	1m 31s
test (macos-14, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	46s
test (macos-latest, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	47s
test (macos-latest, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	56s
test (windows-2019, 3.9, PyQt5~=5.12.0)	1m 57s
test (windows-2019, 3.9, PyQt5~=5.15.0)	2m 2s
test (windows-2019, 3.10, PyQt5~=5.15.0)	1m 24s
test (windows-2019, 3.11, PyQt5~=5.15.0)	2m 15s
test (windows-2019, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	1m 54s
test (windows-2019, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	1m 49s
test (windows-2019, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	1m 24s
	31m 21s

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