Build

(main) Bump AsciidoctorJ to v2.5.12 and JRuby to v9.4.6.0 #856

Job	Run time
Javadocs (ubuntu-latest, 11, 3.9.6)	27s
Sign artifacts (ubuntu-latest, 11, 3.9.6)	39s
Build (ubuntu-latest, 11, 3.8.8)	4m 15s
Build (ubuntu-latest, 11, 3.9.6)	4m 27s
Build (ubuntu-latest, 17, 3.8.8)	4m 6s
Build (ubuntu-latest, 17, 3.9.6)	4m 15s
Build (ubuntu-latest, 21, 3.8.8)	4m 8s
Build (ubuntu-latest, 21, 3.9.6)	4m 16s
Build (windows-latest, 11, 3.8.8)	6m 0s
Build (windows-latest, 11, 3.9.6)	5m 53s
Build (windows-latest, 17, 3.8.8)	5m 49s
Build (windows-latest, 17, 3.9.6)	6m 1s
Build (windows-latest, 21, 3.8.8)	5m 42s
Build (windows-latest, 21, 3.9.6)	6m 25s
Build (macos-latest, 11, 3.8.8)	8m 36s
Build (macos-latest, 11, 3.9.6)	7m 18s
Build (macos-latest, 17, 3.8.8)	8m 3s
Build (macos-latest, 17, 3.9.6)	6m 38s
Build (macos-latest, 21, 3.8.8)	6m 15s
Build (macos-latest, 21, 3.9.6)	9m 21s
	1h 48m 34s

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