Surround variable format with quotes for shell agnosticism (#474) #191

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 4s
test (ubuntu-latest, 28.2, false)	1m 15s
test (ubuntu-latest, 29.3, false)	1m 8s
test (macos-latest, 27.2, false)	50s
test (macos-latest, 28.2, false)	1m 45s
test (macos-latest, 29.3, false)	1m 46s
test (windows-latest, 27.2, false)	1m 27s
test (windows-latest, 28.2, false)	1m 44s
test (windows-latest, 29.3, false)	1m 40s
test (ubuntu-latest, snapshot, true)	57s
test (macos-latest, snapshot, true)	1m 32s
test (windows-latest, snapshot, true)	1m 0s
	16m 8s

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