Add support for IO#timeout. #941

Job	Run time
openssl-1.0.2u	2m 35s
openssl-1.1.0l	1m 32s
openssl-1.1.1w	1m 40s
openssl-3.0.12	3m 3s
ruby-versions / Generate Ruby versions	3s
openssl-3.1.4	2m 51s
openssl-3.2.0	3m 31s
libressl-3.1.5	2m 17s
libressl-3.2.7	2m 11s
libressl-3.3.6	2m 11s
libressl-3.4.3	2m 13s
libressl-3.5.3	2m 17s
libressl-3.6.3	2m 24s
libressl-3.7.3	2m 24s
libressl-3.8.1	2m 8s
openssl-3.0.12 fips	2m 48s
openssl-3.1.4 fips	2m 45s
openssl-3.2.0 fips	3m 25s
openssl-head	3m 17s
openssl-head fips	3m 11s
ubuntu-22.04 2.7	1m 3s
ubuntu-22.04 3.0	51s
ubuntu-22.04 3.1	1m 0s
ubuntu-22.04 3.2	1m 1s
ubuntu-22.04 3.3	1m 0s
ubuntu-22.04 head	56s
ubuntu-22.04 truffleruby	1m 31s
ubuntu-22.04 truffleruby-head	1m 29s
ubuntu-20.04 2.7	1m 0s
ubuntu-20.04 3.0	54s
ubuntu-20.04 3.1	50s
ubuntu-20.04 3.2	50s
ubuntu-20.04 3.3	49s
ubuntu-20.04 head	47s
ubuntu-20.04 truffleruby-head	1m 23s
macos-latest 2.7	1m 21s
macos-latest 3.0	54s
macos-latest 3.1	1m 0s
macos-latest 3.2	1m 25s
macos-latest 3.3	1m 18s
macos-latest head	52s
macos-latest truffleruby-head	2m 28s
windows-latest 2.7	4m 21s
windows-latest 3.0	4m 0s
windows-latest 3.1	4m 4s
windows-latest 3.2	4m 28s
windows-latest 3.3	4m 42s
windows-latest ucrt	3m 42s
windows-latest mswin	2m 27s
	1h 41m 12s

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