chore: bump default pytorch to 2.3.1 #103

Job	Run time
coverage	2m 20s
tests	1m 43s
env (windows-latest)	1m 57s
env (macos-latest)	44s
env (ubuntu-latest)	22s
workflow-coverage / dynamo (float32)	11m 34s
workflow-coverage / overall (float32)	2m 3s
workflow-coverage / slow (float32)	8m 34s
workflow-coverage / overall (float64)	2m 11s
workflow-docs / docstests & sphinx-build - python-3.11, torch-2.3.1	2m 13s
workflow-coverage / slow (float64)	10m 47s
workflow-mypy / python-3.11, torch-2.3.1	1m 2s
workflow-tests / python-3.10, torch-2.1.2	1m 42s
workflow-tutorials / python-3.11, torch-2.3.1	12m 23s
workflow-tests / python-3.10, torch-2.3.1	1m 52s
workflow-tests / python-3.11, torch-2.1.2	1m 43s
workflow-tests / python-3.11, torch-2.3.1	1m 40s
workflow-coverage / report	0s
collector	1s
	1h 4m 51s

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