tests

fix: ReferenceMixin._ref weakrefs after deep copy #910

Job	Run time
test-widget (PyQt5)	56s
test ubuntu-latest (3.9)	1m 7s
test-widget (PySide2)	56s
test macos-latest (3.9)	1m 8s
test-widget (PySide6)	56s
benchmarks	1m 8s
check-manifest	9s
test windows-latest (3.9)	52s
test-widget (PyQt6)	55s
test ubuntu-latest (3.10)	1m 8s
test macos-latest (3.10)	1m 9s
test windows-latest (3.10)	56s
Build	55s
test ubuntu-latest (3.11)	1m 7s
Pydantic compat (3.11, v1)	1m 8s
test macos-latest (3.11)	1m 5s
Pydantic compat (3.11, v2)	1m 6s
test windows-latest (3.11)	54s
Typesafety	29s
test ubuntu-latest (3.12)	1m 7s
Pydantic compat (3.11, both)	1m 8s
test macos-latest (3.12)	1m 8s
test windows-latest (3.12)	54s
Test min reqs (3.10) / ubuntu-latest py3.10	1m 7s
Test min reqs (3.12) / ubuntu-latest py3.12	1m 7s
Deploy	1s
	24m 36s

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