fix string formatting in error message #199

Job	Run time
pre-commit	21s
mypy	15s
tests	4m 27s
isolated_tests (macos-11, 12.4, 3.x)	2m 32s
isolated_tests (macos-11, 13.0, 3.x)	2m 34s
isolated_tests (macos-12, 14.0, 3.x)	1m 40s
isolated_tests (macos-13, 14.2, 3.x)	1m 39s
isolated_tests (ubuntu-latest, 3.7)	13s
isolated_tests (ubuntu-latest, 3.8)	16s
isolated_tests (ubuntu-latest, 3.9)	16s
isolated_tests (ubuntu-latest, 3.10)	13s
isolated_tests (ubuntu-latest, 3.11)	11s
isolated_tests (windows-latest, 3.x)	39s
	15m 16s

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