Avoid mutating SSLContext in SSLServer. #1007

Job	Run time
openssl-1.0.2u	2m 42s
openssl-1.1.0l	1m 32s
openssl-1.1.1w	1m 40s
openssl-3.0.13	2m 52s
openssl-3.1.5	2m 53s
openssl-3.2.1	3m 23s
libressl-3.1.5	2m 7s
libressl-3.2.7	2m 11s
libressl-3.3.6	2m 16s
libressl-3.4.3	2m 16s
libressl-3.5.3	2m 12s
libressl-3.6.3	2m 22s
libressl-3.7.3	2m 11s
libressl-3.8.2	2m 14s
openssl-3.0.13 fips	2m 42s
openssl-3.1.5 fips	2m 50s
openssl-3.2.1 fips	3m 7s
openssl-head	3m 23s
openssl-head fips	3m 19s
openssl-head no-legacy	3m 22s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	1m 1s
ubuntu-22.04 3.0	55s
ubuntu-22.04 3.1	56s
ubuntu-22.04 3.2	1m 0s
ubuntu-22.04 3.3	55s
ubuntu-22.04 head	54s
ubuntu-22.04 truffleruby	1m 19s
ubuntu-22.04 truffleruby-head	1m 31s
ubuntu-20.04 2.7	54s
ubuntu-20.04 3.0	51s
ubuntu-20.04 3.1	54s
ubuntu-20.04 3.2	54s
ubuntu-20.04 3.3	50s
ubuntu-20.04 head	59s
ubuntu-20.04 truffleruby-head	1m 24s
macos-latest 2.7	2m 5s
macos-latest 3.0	1m 36s
macos-latest 3.1	1m 25s
macos-latest 3.2	1m 5s
macos-latest 3.3	3m 23s
macos-latest head	3m 49s
macos-latest truffleruby-head	3m 7s
windows-latest 2.7	4m 37s
windows-latest 3.0	3m 44s
windows-latest 3.1	3m 54s
windows-latest 3.2	4m 28s
windows-latest 3.3	5m 12s
windows-latest ucrt	3m 41s
windows-latest mswin	2m 35s
	1h 51m 34s

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