Bugfix PyPushGroup refcount, need to hold a ref around in case it dro… #1344

Job	Run time
initialize	3s
build_sdist (ubuntu-24.04, 3.9)	41s
lint (ubuntu-24.04, 3.9)	45s
build (ubuntu-24.04, 3.8, cp38, false)	33m 14s
build (ubuntu-24.04, 3.9, cp39, false)	32m 19s
build (ubuntu-24.04, 3.10, cp310, false)	33m 21s
build (ubuntu-24.04, 3.11, cp311, false)	33m 5s
build (ubuntu-24.04, 3.12, cp312, false)	32m 33s
build (macos-14, 3.11, cp311, false)	13m 0s
build (macos-14, 3.12, cp312, false)	14m 0s
build (windows-2019, 3.12, cp312, false)	1h 8m 57s
test_sdist	0s
test_dependencies (ubuntu-20.04, 3.9, sqlalchemy<2)	1m 3s
test (ubuntu-24.04, 3.8, false)	2m 16s
test_dependencies (ubuntu-20.04, 3.9, numpy==1.22.4)	2m 18s
test (ubuntu-24.04, 3.9, false)	2m 20s
test_dependencies (ubuntu-20.04, 3.9, perspective-python<3)	1m 6s
test (ubuntu-24.04, 3.10, false)	2m 19s
test (ubuntu-24.04, 3.11, false)	2m 51s
test (ubuntu-24.04, 3.12, false)	2m 21s
test (macos-14, 3.11, false)	2m 48s
test (macos-14, 3.12, false)	2m 39s
test (windows-2019, 3.12, false)	4m 58s
publish_release_artifacts	0s
	4h 48m 57s

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