tests

fix: ReferenceMixin._ref weakrefs after deep copy #915

Job	Run time
test ubuntu-latest (3.9)	2m 21s
test macos-latest (3.9)	1m 29s
check-manifest	11s
Build	57s
test windows-latest (3.9)	2m 57s
test ubuntu-latest (3.10)	2m 13s
Pydantic compat (3.11, v1)	1m 37s
test-widget (PyQt5)	1m 8s
test macos-latest (3.10)	1m 21s
Pydantic compat (3.11, v2)	1m 37s
benchmarks	6m 44s
test windows-latest (3.10)	2m 45s
Pydantic compat (3.11, both)	1m 42s
test ubuntu-latest (3.11)	2m 8s
test macos-latest (3.11)	1m 33s
test-widget (PySide2)	1m 7s
test windows-latest (3.11)	2m 18s
Typesafety	31s
test-widget (PySide6)	2m 16s
test ubuntu-latest (3.12)	2m 33s
test-widget (PyQt6)	1m 4s
test macos-latest (3.12)	1m 16s
test windows-latest (3.12)	4m 37s
Test min reqs (3.10) / ubuntu-latest py3.10	1m 45s
Test min reqs (3.12) / ubuntu-latest py3.12	2m 7s
Deploy	0s
	50m 17s

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