Update dependency ruby to v2.7.8 #127

Job	Run time
Puppet Syntax	31s
Ruby Style	35s
File checks	31s
Puppet Style	1m 15s
RELENG checks	35s
Puppet Spec (Puppet 7.x [SIMP 6.6/PE 2021.7], ~> 7.0, 2.7, false)	1m 3s
Puppet Spec (Puppet 8.x, ~> 8.0, 3.2, false)	1m 22s
	5m 52s

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