MONGOID-5809: remove ruby -w warnings #3843

Job	Run time
ruby-3.3 drv:current db:7.0 rails: fle: replica_set	13m 28s
ruby-3.2 drv:current db:6.0 rails: fle: replica_set	13m 31s
ruby-3.1 drv:current db:6.0 rails: fle: replica_set	14m 4s
ruby-3.0 drv:stable db:6.0 rails: fle: replica_set	13m 28s
ruby-3.3 drv:current db:7.0 rails:8.0 fle:helper server	12m 13s
ruby-3.2 drv:current db:7.0 rails:7.2 fle:helper server	12m 25s
ruby-3.2 drv:current db:7.0 rails:7.1 fle:helper server	12m 13s
ruby-3.1 drv:current db:7.0 rails:7.0 fle:helper server	12m 30s
ruby-3.1 drv:current db:6.0 rails:6.1 fle:helper server	12m 15s
ruby-3.0 drv:current db:6.0 rails:6.1 fle:helper server	12m 43s
ruby-3.0 drv:current db:6.0 rails:6.0 fle:helper server	12m 31s
jruby-9.4 drv:current db:6.0 rails:6.0 fle:helper server	21m 22s
ruby-3.1 drv:current db:5.0 rails: fle: replica_set	13m 50s
ruby-2.7 drv:current db:4.4 rails: fle: replica_set	13m 14s
	3h 9m 47s

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