Add support for IO#timeout. #937

Job	Run time
openssl-1.0.2u	2m 35s
openssl-1.1.0l	1m 29s
openssl-1.1.1w	1m 48s
openssl-3.0.12	2m 59s
openssl-3.1.4	2m 56s
openssl-3.2.0	3m 26s
libressl-3.1.5	2m 6s
ruby-versions / Generate Ruby versions	2s
libressl-3.2.7	2m 10s
libressl-3.3.6	2m 16s
libressl-3.4.3	2m 24s
libressl-3.5.3	2m 16s
libressl-3.6.3	2m 18s
libressl-3.7.3	2m 15s
libressl-3.8.1	2m 14s
openssl-3.0.12 fips	2m 44s
openssl-3.1.4 fips	2m 59s
openssl-3.2.0 fips	3m 23s
openssl-head	3m 16s
openssl-head fips	3m 16s
ubuntu-22.04 2.7	59s
ubuntu-22.04 3.0	55s
ubuntu-22.04 3.1	34s
ubuntu-22.04 3.2	57s
ubuntu-22.04 3.3	55s
ubuntu-22.04 head	57s
ubuntu-22.04 truffleruby	1m 33s
ubuntu-22.04 truffleruby-head	54s
ubuntu-20.04 2.7	56s
ubuntu-20.04 3.0	52s
ubuntu-20.04 3.1	30s
ubuntu-20.04 3.2	55s
ubuntu-20.04 3.3	49s
ubuntu-20.04 head	51s
ubuntu-20.04 truffleruby-head	50s
macos-latest 2.7	1m 17s
macos-latest 3.0	1m 46s
macos-latest 3.1	1m 56s
macos-latest 3.2	1m 29s
macos-latest 3.3	58s
macos-latest head	1m 24s
macos-latest truffleruby-head	1m 13s
windows-latest 2.7	4m 13s
windows-latest 3.0	3m 49s
windows-latest 3.1	3m 10s
windows-latest 3.2	4m 9s
windows-latest 3.3	5m 54s
windows-latest ucrt	3m 35s
windows-latest mswin	2m 17s
	1h 39m 29s

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