Remove `object_id` use in `OpenStruct#inspect` #148

Job	Run time
ruby-versions / Generate Ruby versions	6s
build (2.5 / ubuntu-latest)	21s
build (2.5 / macos-latest)	53s
build (2.6 / ubuntu-latest)	22s
build (2.6 / macos-latest)	1m 6s
build (2.7 / ubuntu-latest)	22s
build (2.7 / macos-latest)	51s
build (3.0 / ubuntu-latest)	6s
build (3.0 / macos-latest)	12s
build (3.1 / ubuntu-latest)	6s
build (3.1 / macos-latest)	15s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	20s
build (head / ubuntu-latest)	6s
build (head / macos-latest)	15s
build (jruby / ubuntu-latest)	32s
build (jruby / macos-latest)	2m 26s
build (jruby-head / ubuntu-latest)	31s
build (jruby-head / macos-latest)	56s
build (truffleruby / ubuntu-latest)	26s
build (truffleruby / macos-latest)	49s
build (truffleruby-head / ubuntu-latest)	26s
build (truffleruby-head / macos-latest)	50s
	12m 24s

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