test_asn1.rb: Remove the assertions of the time string format without second. #976

Job	Run time
openssl-1.0.2u	2m 31s
openssl-1.1.0l	1m 29s
openssl-1.1.1w	1m 47s
openssl-3.0.13	3m 1s
openssl-3.1.5	2m 59s
openssl-3.2.1	3m 22s
libressl-3.1.5	2m 3s
libressl-3.2.7	2m 14s
libressl-3.3.6	2m 17s
libressl-3.4.3	2m 23s
libressl-3.5.3	2m 21s
libressl-3.6.3	2m 20s
libressl-3.7.3	2m 24s
libressl-3.8.2	2m 10s
openssl-3.0.13 fips	2m 54s
openssl-3.1.5 fips	2m 45s
openssl-3.2.1 fips	3m 19s
openssl-head	3m 28s
openssl-head fips	3m 31s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	57s
ubuntu-22.04 3.0	52s
ubuntu-22.04 3.1	59s
ubuntu-22.04 3.2	58s
ubuntu-22.04 3.3	53s
ubuntu-22.04 head	55s
ubuntu-22.04 truffleruby	1m 32s
ubuntu-22.04 truffleruby-head	1m 30s
ubuntu-20.04 2.7	54s
ubuntu-20.04 3.0	53s
ubuntu-20.04 3.1	54s
ubuntu-20.04 3.2	51s
ubuntu-20.04 3.3	51s
ubuntu-20.04 head	48s
ubuntu-20.04 truffleruby-head	1m 24s
macos-latest 2.7	1m 20s
macos-latest 3.0	59s
macos-latest 3.1	1m 0s
macos-latest 3.2	59s
macos-latest 3.3	1m 33s
macos-latest head	53s
macos-latest truffleruby-head	2m 35s
windows-latest 2.7	6m 4s
windows-latest 3.0	4m 13s
windows-latest 3.1	4m 13s
windows-latest 3.2	5m 20s
windows-latest 3.3	4m 12s
windows-latest ucrt	4m 3s
windows-latest mswin	2m 28s
	1h 44m 24s

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