Deal with loss of whitespace in Python 3.13. #349

Job	Run time
Build and run tests (ubuntu-latest, 3.9)	4m 38s
Build and run tests (ubuntu-latest, 3.10)	3m 59s
Build and run tests (ubuntu-latest, 3.11)	3m 55s
Build and run tests (ubuntu-latest, 3.12)	4m 20s
Build and run tests (ubuntu-latest, 3.13)	4m 7s
Build and run tests (macos-13, 3.9)	5m 28s
Build and run tests (macos-13, 3.10)	5m 39s
Build and run tests (macos-13, 3.11)	6m 44s
Build and run tests (macos-13, 3.12)	11m 40s
Build and run tests (macos-13, 3.13)	7m 17s
Build and run tests (macos-latest, 3.9)	2m 48s
Build and run tests (macos-latest, 3.10)	3m 37s
Build and run tests (macos-latest, 3.11)	5m 11s
Build and run tests (macos-latest, 3.12)	3m 23s
Build and run tests (macos-latest, 3.13)	3m 8s
Build and run tests (windows-latest, 3.9)	8m 25s
Build and run tests (windows-latest, 3.10)	9m 11s
Build and run tests (windows-latest, 3.11)	8m 52s
Build and run tests (windows-latest, 3.12)	9m 35s
Build and run tests (windows-latest, 3.13)	8m 36s
	2h 0m 33s

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