Avoid mutating SSLContext in SSLServer. #1007

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

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