Add support for IO#timeout. #939

Job	Run time
openssl-1.0.2u	2m 22s
openssl-1.1.0l	1m 30s
openssl-1.1.1w	1m 46s
openssl-3.0.12	2m 51s
ruby-versions / Generate Ruby versions	1s
openssl-3.1.4	3m 2s
openssl-3.2.0	3m 29s
libressl-3.1.5	2m 5s
libressl-3.2.7	2m 29s
libressl-3.3.6	2m 13s
libressl-3.4.3	2m 14s
libressl-3.5.3	2m 15s
libressl-3.6.3	2m 33s
libressl-3.7.3	2m 15s
libressl-3.8.1	2m 14s
openssl-3.0.12 fips	2m 41s
openssl-3.1.4 fips	2m 44s
openssl-3.2.0 fips	3m 34s
openssl-head	3m 24s
openssl-head fips	3m 19s
ubuntu-22.04 2.7	59s
ubuntu-22.04 3.0	2m 16s
ubuntu-22.04 3.1	2m 18s
ubuntu-22.04 3.2	57s
ubuntu-22.04 3.3	53s
ubuntu-22.04 head	54s
ubuntu-22.04 truffleruby	1m 29s
ubuntu-22.04 truffleruby-head	56s
ubuntu-20.04 2.7	55s
ubuntu-20.04 3.0	55s
ubuntu-20.04 3.1	53s
ubuntu-20.04 3.2	51s
ubuntu-20.04 3.3	47s
ubuntu-20.04 head	48s
ubuntu-20.04 truffleruby-head	50s
macos-latest 2.7	1m 20s
macos-latest 3.0	56s
macos-latest 3.1	1m 54s
macos-latest 3.2	1m 0s
macos-latest 3.3	58s
macos-latest head	51s
macos-latest truffleruby-head	1m 8s
windows-latest 2.7	4m 50s
windows-latest 3.0	3m 46s
windows-latest 3.1	4m 47s
windows-latest 3.2	4m 14s
windows-latest 3.3	3m 59s
windows-latest ucrt	4m 7s
windows-latest mswin	3m 13s
	1h 42m 45s

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