digest: remove optional parameter from OpenSSL::Digest#finish #1283

Job	Run time
openssl-1.0.2u	54s
openssl-1.1.0l	52s
openssl-1.1.1w	57s
ruby-versions / Generate Ruby versions	2s
openssl-3.0.15	1m 2s
openssl-3.1.7	57s
openssl-3.2.3	3m 39s
openssl-3.3.2	3m 52s
openssl-3.4.0	3m 52s
openssl-master	3m 46s
libressl-3.1.5	55s
libressl-3.2.7	1m 0s
libressl-3.3.6	1m 1s
libressl-3.4.3	1m 7s
libressl-3.5.3	1m 1s
libressl-3.6.3	58s
libressl-3.7.3	56s
libressl-3.8.4	58s
libressl-3.9.2	58s
libressl-4.0.0	1m 7s
openssl-3.0.15 with fips provider	55s
openssl-3.1.7 with fips provider	3m 29s
openssl-3.2.3 with fips provider	3m 35s
openssl-3.3.2 with fips provider	3m 44s
openssl-3.4.0 with fips provider	3m 47s
openssl-master with fips provider	3m 50s
openssl-3.4.0 without legacy provider	3m 50s
ubuntu-22.04 2.7	59s
ubuntu-22.04 3.0	1m 1s
ubuntu-22.04 3.1	1m 0s
ubuntu-22.04 3.2	58s
ubuntu-22.04 3.3	1m 0s
ubuntu-22.04 head	1m 3s
ubuntu-22.04 truffleruby	1m 31s
ubuntu-22.04 truffleruby-head	1m 51s
ubuntu-20.04 2.7	1m 4s
ubuntu-20.04 3.0	57s
ubuntu-20.04 3.1	57s
ubuntu-20.04 3.2	1m 0s
ubuntu-20.04 3.3	54s
ubuntu-20.04 head	1m 0s
ubuntu-20.04 truffleruby	1m 41s
ubuntu-20.04 truffleruby-head	1m 39s
macos-latest 2.7	53s
macos-latest 3.0	34s
macos-latest 3.1	37s
macos-latest 3.2	39s
macos-latest 3.3	35s
macos-latest head	40s
macos-latest truffleruby	1m 21s
macos-latest truffleruby-head	1m 17s
windows-latest 2.7	5m 53s
windows-latest 3.0	3m 58s
windows-latest 3.1	4m 48s
windows-latest 3.2	4m 25s
windows-latest 3.3	5m 3s
windows-latest head	3m 48s
windows-latest ucrt	3m 47s
windows-latest mswin	3m 11s
	1h 53m 8s

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