MONGOID-5816: attr_readonly leaks into sibling classes (#5918) #3834

Job	Run time
ruby-3.3 drv:current db:7.0 rails: fle: replica_set	13m 21s
ruby-3.2 drv:current db:6.0 rails: fle: replica_set	13m 6s
ruby-3.1 drv:current db:6.0 rails: fle: replica_set	14m 7s
ruby-3.0 drv:stable db:6.0 rails: fle: replica_set	13m 42s
ruby-3.3 drv:current db:7.0 rails:8.0 fle:helper server	12m 32s
ruby-3.2 drv:current db:7.0 rails:7.2 fle:helper server	11m 55s
ruby-3.2 drv:current db:7.0 rails:7.1 fle:helper server	12m 54s
ruby-3.1 drv:current db:7.0 rails:7.0 fle:helper server	12m 19s
ruby-3.1 drv:current db:6.0 rails:6.1 fle:helper server	12m 19s
ruby-3.0 drv:current db:6.0 rails:6.1 fle:helper server	12m 59s
ruby-3.0 drv:current db:6.0 rails:6.0 fle:helper server	12m 10s
jruby-9.4 drv:current db:6.0 rails:6.0 fle:helper server	21m 55s
ruby-3.1 drv:current db:5.0 rails: fle: replica_set	13m 34s
ruby-2.7 drv:current db:4.4 rails: fle: replica_set	13m 53s
	3h 10m 46s

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