Bump @antora/site-generator from 3.2.0-alpha.4 to 3.2.0-alpha.11 in /antora#20

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dependabot/npm_and_yarn/antora/antora/site-generator-3.2.0-alpha.11scottfrederick/spring-boot:dependabot/npm_and_yarn/antora/antora/site-generator-3.2.0-alpha.11Copy head branch name to clipboard