Remove references to "19" methods in JRuby #247

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-20.04 2.3	58s
ubuntu-20.04 2.4	53s
ubuntu-20.04 2.5	55s
ubuntu-20.04 2.6	58s
ubuntu-20.04 2.7	54s
ubuntu-20.04 3.0	22s
ubuntu-20.04 3.1	21s
ubuntu-20.04 3.2	17s
ubuntu-20.04 3.3	21s
ubuntu-20.04 head	20s
ubuntu-20.04 jruby	31s
ubuntu-20.04 jruby-head	38s
ubuntu-22.04 2.3	55s
ubuntu-22.04 2.4	53s
ubuntu-22.04 2.5	54s
ubuntu-22.04 2.6	58s
ubuntu-22.04 2.7	56s
ubuntu-22.04 3.0	23s
ubuntu-22.04 3.1	20s
ubuntu-22.04 3.2	16s
ubuntu-22.04 3.3	20s
ubuntu-22.04 head	20s
ubuntu-22.04 jruby	42s
ubuntu-22.04 jruby-head	30s
macos-12 2.3	2m 0s
macos-12 2.4	1m 51s
macos-12 2.5	2m 1s
macos-12 2.6	2m 19s
macos-12 2.7	2m 11s
macos-12 3.0	23s
macos-12 3.1	40s
macos-12 3.2	32s
macos-12 3.3	33s
macos-12 head	31s
macos-12 jruby	40s
macos-12 jruby-head	49s
macos-13 2.3	2m 2s
macos-13 2.4	1m 56s
macos-13 2.5	3m 8s
macos-13 2.6	2m 6s
macos-13 2.7	1m 56s
macos-13 3.0	28s
macos-13 3.1	43s
macos-13 3.2	31s
macos-13 3.3	40s
macos-13 head	32s
macos-13 jruby	52s
macos-13 jruby-head	1m 6s
macos-14 2.6	1m 14s
macos-14 2.7	58s
macos-14 3.0	18s
macos-14 3.1	22s
macos-14 3.2	17s
macos-14 3.3	25s
macos-14 head	24s
macos-14 jruby	50s
macos-14 jruby-head	24s
windows-latest 2.3	2m 10s
windows-latest 2.4	2m 42s
windows-latest 2.5	3m 30s
windows-latest 2.6	3m 59s
windows-latest 2.7	2m 55s
windows-latest 3.0	1m 16s
windows-latest 3.1	1m 13s
windows-latest 3.2	1m 50s
windows-latest 3.3	1m 56s
windows-latest head	1m 15s
windows-latest mswin	1m 3s
ubuntu-latest jruby-9.1	43s
ubuntu-latest jruby-9.2	43s
ubuntu-latest jruby-9.3	37s
ubuntu-latest jruby-9.4	32s
	1h 17m 4s

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