Bump puma from 6.5.0 to 6.6.0 #97

Job	Run time
bundle-audit / build	1m 6s
cucumber-admin / build	2m 29s
brakeman / build	1m 12s
cucumber-public / build	2m 20s
javascript / build	1m 22s
lighthouse / build	2m 12s
spec-admin-controllers / build	2m 39s
spec-jobs / build	3m 1s
spec-mailers / build	1m 35s
spec-models / build	4m 19s
spec-other / build	1m 41s
spec-public-controllers / build	2m 18s
spec-requests / build	3m 31s
	29m 45s

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