Avoid mutating SSLContext in SSLServer. #1008

Job	Run time	Billable time
openssl-1.0.2u	2m 27s	0s
openssl-1.1.0l	1m 31s	0s
ruby-versions / Generate Ruby versions	3s	0s
openssl-1.1.1w	1m 41s	0s
openssl-3.0.13	2m 49s	0s
openssl-3.1.5	2m 52s	0s
openssl-3.2.1	3m 13s	0s
libressl-3.1.5	2m 8s	0s
libressl-3.2.7	2m 16s	0s
libressl-3.3.6	2m 11s	0s
libressl-3.4.3	2m 18s	0s
libressl-3.5.3	2m 13s	0s
libressl-3.6.3	2m 18s	0s
libressl-3.7.3	2m 12s	0s
libressl-3.8.2	2m 10s	0s
openssl-3.0.13 fips	2m 51s	0s
openssl-3.1.5 fips	2m 47s	0s
openssl-3.2.1 fips	3m 19s	0s
openssl-head	3m 22s	0s
openssl-head fips	3m 21s	0s
openssl-head no-legacy	3m 32s	0s
ubuntu-22.04 2.7	1m 0s	0s
ubuntu-22.04 3.0	52s	0s
ubuntu-22.04 3.1	59s	0s
ubuntu-22.04 3.2	56s	0s
ubuntu-22.04 3.3	55s	0s
ubuntu-22.04 head	57s	0s
ubuntu-22.04 truffleruby	1m 25s	0s
ubuntu-22.04 truffleruby-head	1m 29s	0s
ubuntu-20.04 2.7	54s	0s
ubuntu-20.04 3.0	54s	0s
ubuntu-20.04 3.1	1m 0s	0s
ubuntu-20.04 3.2	53s	0s
ubuntu-20.04 3.3	49s	0s
ubuntu-20.04 head	50s	0s
ubuntu-20.04 truffleruby-head	1m 27s	0s
macos-latest 2.7	1m 18s	0s
macos-latest 3.0	53s	0s
macos-latest 3.1	3m 47s	0s
macos-latest 3.2	3m 57s	0s
macos-latest 3.3	1m 25s	0s
macos-latest head	4m 9s	0s
macos-latest truffleruby-head	1m 36s	0s
windows-latest 2.7	5m 5s	0s
windows-latest 3.0	4m 1s	0s
windows-latest 3.1	3m 48s	0s
windows-latest 3.2	5m 3s	0s
windows-latest 3.3	4m 53s	0s
windows-latest ucrt	3m 25s	0s
windows-latest mswin	2m 25s	0s
	1h 52m 39s	0s

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