MONGOID-5816: attr_readonly leaks into sibling classes #3828

Job	Run time
ruby-3.3 drv:current db:7.0 rails: fle: replica_set	13m 52s
ruby-3.2 drv:current db:6.0 rails: fle: replica_set	13m 20s
ruby-3.1 drv:current db:6.0 rails: fle: replica_set	13m 42s
ruby-3.0 drv:stable db:6.0 rails: fle: replica_set	14m 2s
ruby-3.3 drv:current db:7.0 rails:8.0 fle:helper server	13m 4s
ruby-3.2 drv:current db:7.0 rails:7.2 fle:helper server	12m 14s
ruby-3.2 drv:current db:7.0 rails:7.1 fle:helper server	12m 29s
ruby-3.1 drv:current db:7.0 rails:7.0 fle:helper server	12m 42s
ruby-3.1 drv:current db:6.0 rails:6.1 fle:helper server	12m 8s
ruby-3.0 drv:current db:6.0 rails:6.1 fle:helper server	12m 44s
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	23m 16s
ruby-3.1 drv:current db:5.0 rails: fle: replica_set	13m 30s
ruby-2.7 drv:current db:4.4 rails: fle: replica_set	13m 29s
	3h 13m 3s

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