x509ext: let X509::ExtensionFactory#create_ext take a dotted OID string #5

Job	Run time
openssl-1.0.2u	3m 16s
openssl-1.1.0l	2m 34s
openssl-1.1.1v	2m 25s
openssl-3.0.10	5m 32s
openssl-3.1.2	4m 20s
libressl-3.1.5	3m 59s
libressl-3.2.7	3m 14s
libressl-3.3.6	3m 9s
libressl-3.4.3	3m 45s
libressl-3.5.3	3m 13s
libressl-3.6.3	3m 24s
libressl-3.7.3	3m 15s
libressl-3.8.0	3m 8s
openssl-3.0.10 fips	5m 39s
openssl-3.1.2 fips	4m 39s
openssl-head	6m 29s
openssl-head fips	5m 11s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	1m 28s
ubuntu-22.04 3.0	1m 10s
ubuntu-22.04 3.1	1m 27s
ubuntu-22.04 3.2	1m 11s
ubuntu-22.04 head	1m 8s
ubuntu-22.04 truffleruby	1m 44s
ubuntu-22.04 truffleruby-head	1m 49s
ubuntu-20.04 2.7	1m 28s
ubuntu-20.04 3.0	1m 4s
ubuntu-20.04 3.1	1m 7s
ubuntu-20.04 3.2	1m 7s
ubuntu-20.04 head	1m 3s
ubuntu-20.04 truffleruby-head	1m 43s
macos-latest 2.7	1m 57s
macos-latest 3.0	1m 26s
macos-latest 3.1	1m 32s
macos-latest 3.2	1m 27s
macos-latest head	1m 19s
macos-latest truffleruby-head	4m 9s
windows-latest 2.7	6m 40s
windows-latest 3.0	5m 53s
windows-latest 3.1	5m 50s
windows-latest 3.2	6m 38s
windows-latest ucrt	4m 51s
windows-latest mswin	2m 48s
	2h 9m 13s

Provide feedback