Bump antora from 3.2.0-alpha.8 to 3.2.0-alpha.9 in /docs#17726

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dependabot/npm_and_yarn/docs/6.3.x/antora-3.2.0-alpha.9spring-projects/spring-security:dependabot/npm_and_yarn/docs/6.3.x/antora-3.2.0-alpha.9Copy head branch name to clipboard