digest: remove optional parameter from OpenSSL::Digest#finish #1268

Job	Run time
openssl-1.0.2u	24s
openssl-1.1.0l	31s
openssl-1.1.1w	26s
openssl-3.0.15	32s
openssl-3.1.7	29s
openssl-3.2.3	29s
openssl-3.3.2	29s
openssl-3.4.0	33s
openssl-master	3m 47s
libressl-3.1.5	25s
libressl-3.2.7	25s
libressl-3.3.6	31s
libressl-3.4.3	26s
libressl-3.5.3	38s
libressl-3.6.3	36s
libressl-3.7.3	37s
libressl-3.8.4	30s
libressl-3.9.2	24s
libressl-4.0.0	32s
openssl-3.0.15 with fips provider	28s
openssl-3.1.7 with fips provider	33s
openssl-3.2.3 with fips provider	29s
openssl-3.3.2 with fips provider	34s
openssl-3.4.0 with fips provider	34s
openssl-master with fips provider	3m 54s
openssl-3.4.0 without legacy provider	34s
ruby-versions / Generate Ruby versions	1s
ubuntu-22.04 2.7	35s
ubuntu-22.04 3.0	48s
ubuntu-22.04 3.1	29s
ubuntu-22.04 3.2	28s
ubuntu-22.04 3.3	26s
ubuntu-22.04 head	26s
ubuntu-22.04 truffleruby	37s
ubuntu-22.04 truffleruby-head	50s
ubuntu-20.04 2.7	31s
ubuntu-20.04 3.0	23s
ubuntu-20.04 3.1	25s
ubuntu-20.04 3.2	25s
ubuntu-20.04 3.3	25s
ubuntu-20.04 head	25s
ubuntu-20.04 truffleruby	38s
ubuntu-20.04 truffleruby-head	45s
macos-latest 2.7	44s
macos-latest 3.0	28s
macos-latest 3.1	23s
macos-latest 3.2	44s
macos-latest 3.3	32s
macos-latest head	26s
macos-latest truffleruby	37s
macos-latest truffleruby-head	43s
windows-latest 2.7	4m 13s
windows-latest 3.0	4m 16s
windows-latest 3.1	4m 11s
windows-latest 3.2	3m 30s
windows-latest 3.3	4m 14s
windows-latest head	2m 45s
windows-latest ucrt	2m 58s
windows-latest mswin	2m 57s
	1h 2m 8s

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