Tests

Fix `BatchedGraph.from_graphs` RuntimeError from mismatching dtypes #415

Job	Run time
tests (ubuntu-latest)	6m 26s
tests (macos-latest)	10m 47s
tests (windows-latest)	17m 22s
Build wheels for Python ${{ matrix.python-version }} on ${{ matrix.os }}	0s
Build source distribution	0s
Release wheels and source distribution to PyPI	0s
	34m 35s

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