Bump @springio/asciidoctor-extensions in /docs (#974) #93

Job	Run time
deploy / setup	4s
deploy / Build main (JDK 25)	4m 29s
deploy / Build main (JDK 17)	5m 16s
deploy / Build main (JDK 21)	4m 35s
deploy / Trigger CI for non-default branches	0s
	14m 24s

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