.github/workflows/ci.yml

Use single quotes around 'maybe' atom for compatibility with OTP 27 #77

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Run time

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Job	Run time
test 26.0.2.0 on ubuntu-latest	57s
test 25.3.2.3 on ubuntu-latest	53s
test 24.3.4.13 on ubuntu-latest	52s
test 23.3.4.18 on ubuntu-latest	1m 5s
test 22.3.4.26 on ubuntu-latest	55s
test 21.3.8.24 on ubuntu-latest	43s
test 20.3.8.26 on ubuntu-latest	46s
test 19.3.6.13 on ubuntu-latest	50s
test 18.3.4.11 on ubuntu-latest	55s
	7m 56s