Add support for IO#timeout. #938

Job	Run time
openssl-1.0.2u	2m 25s
openssl-1.1.0l	1m 36s
openssl-1.1.1w	1m 44s
openssl-3.0.12	2m 53s
ruby-versions / Generate Ruby versions	8s
openssl-3.1.4	2m 51s
openssl-3.2.0	3m 30s
libressl-3.1.5	2m 2s
libressl-3.2.7	2m 10s
libressl-3.3.6	2m 31s
libressl-3.4.3	2m 12s
libressl-3.5.3	2m 16s
libressl-3.6.3	2m 17s
libressl-3.7.3	2m 26s
libressl-3.8.1	2m 10s
openssl-3.0.12 fips	2m 43s
openssl-3.1.4 fips	2m 44s
openssl-3.2.0 fips	3m 25s
openssl-head	3m 19s
openssl-head fips	3m 16s
ubuntu-22.04 2.7	57s
ubuntu-22.04 3.0	51s
ubuntu-22.04 3.1	1m 1s
ubuntu-22.04 3.2	59s
ubuntu-22.04 3.3	53s
ubuntu-22.04 head	57s
ubuntu-22.04 truffleruby	1m 31s
ubuntu-22.04 truffleruby-head	1m 31s
ubuntu-20.04 2.7	56s
ubuntu-20.04 3.0	50s
ubuntu-20.04 3.1	53s
ubuntu-20.04 3.2	50s
ubuntu-20.04 3.3	46s
ubuntu-20.04 head	50s
ubuntu-20.04 truffleruby-head	1m 37s
macos-latest 2.7	1m 20s
macos-latest 3.0	57s
macos-latest 3.1	59s
macos-latest 3.2	2m 44s
macos-latest 3.3	10m 34s
macos-latest head	1m 27s
macos-latest truffleruby-head	2m 36s
windows-latest 2.7	4m 18s
windows-latest 3.0	4m 19s
windows-latest 3.1	3m 50s
windows-latest 3.2	4m 26s
windows-latest 3.3	4m 40s
windows-latest ucrt	3m 46s
windows-latest mswin	2m 38s
	1h 52m 34s

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