Ensure rustfmt is invoked without edition parameter #301

Job	Run time
test (ubuntu-latest, 26.3)	46s
test (ubuntu-latest, 28.2)	51s
test (ubuntu-latest, 27.2)	50s
test (macos-latest, 28.2)	2m 39s
test (windows-latest, 27.2)	3m 20s
test (macos-latest, 30.1)	5m 42s
test (ubuntu-latest, 30.1)	1m 43s
test (ubuntu-latest, snapshot, true)	47s
test (macos-latest, 29.4)	4m 55s
test (windows-latest, snapshot, true)	5m 14s
test (windows-latest, 28.2)	2m 48s
test (macos-latest, snapshot, true)	2m 30s
test (windows-latest, 26.3)	8m 13s
test (windows-latest, 29.4)	6m 36s
test (windows-latest, 30.1)	3m 25s
test (ubuntu-latest, 29.4)	2m 57s
	53m 16s

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