Upgrading antora to 3.2.0-alpha.12 #168

Job	Run time
deploy / setup	6s
deploy / Build 4.3.x (JDK 17)	9m 20s
deploy / Build 4.3.x (JDK 21)	7m 4s
deploy / Trigger CI for non-default branches	-1s
	16m 29s

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