Bump antora from 3.2.0-alpha.9 to 3.2.0-alpha.11 in /docs (#976) #95

Job	Run time
deploy / setup	5s
deploy / Build main (JDK 17)	5m 45s
deploy / Build main (JDK 25)	4m 33s
deploy / Build main (JDK 21)	4m 9s
deploy / Trigger CI for non-default branches	0s
	14m 32s

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