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

[dependabot]

Bumps antora from 3.2.0-alpha.8 to 3.2.0-alpha.9.

Changelog

Sourced from antora's changelog.

== 3.2.0-alpha.9 (2025-08-11)

=== Added

• content-classifier: Allow file to be explicitly marked as private; not private bypasses underscore check (#1153)
• content-classifier: Assign unique origins as set to origins property on component version; use empty set if no origins specified (#995)
• navigation-builder: Propagate roles and additional link properties on xref to entry in navigation model (#1175)
• page-composer: Add file property to UI model of page that resolves to raw virtual file of page (#1165)
• page-composer: Add built-in resolveResource UI helper to resolve raw virtual file of resource by reference (#1167)

=== Changed

• playbook-builder: Allow site URL to be unset using --url CLI option or URL environment variable with empty value or ~ (#1125)
• playbook-builder: Rework buildPlaybook so it only processes args and env once
• playbook-builder: Require YAML tag on attribute or site key value to enable YAML parsing; don't strip quotes around value (#1115)
• playbook-builder: Use YAML serialization internally for map and primitive-map values read from arguments (i.e., CLI options)
• content-aggregator: Skip check for remote branches in non-managed repository with no remote (#1179)
• content-aggregator: Skip check for local branches in managed repository (#1111)
• page-composer: resolvePage and resolvePageURL helpers resolve current page when called with no arguments (#1166)
• page-composer: Populate breadcrumbs for orphan page when component version has no navigation (#1176)
• site-generator: Log warning (instead of crashing) if Antora extension in playbook is missing require key (#1177)
• site-generator: Add require option to require method on GeneratorContext to use as fallback if module-scoped require fails (#1178)

=== Fixed

• content-aggregator: Discover linked worktree attached to bare repository when worktree is used as content source (#1111)
• content-aggregator: Discover linked worktree attached to bare repository when bare repository is used as content source (#1111)
• content-aggregator: Coerce version value to string in refname projection; coerce null value to empty string (#1170)
• page-composer: Fix crash if resolvePage or resolvePageURL helpers are called with no arguments
• asciidoc-loader: Restore support for relative path token for include file in example or partial family (#1173)

Commits

• d83e7e4 release 3.2.0-alpha.9
• 64277d3 merge !1077
• 3fe70fc resolves #1115 require YAML tag on attribute or site key value to enable YAML...
• 661824d merge !1080
• 087a744 resolves #995 assign unique origins as set to origins property on component v...
• 6a1b8fb merge !1081
• fa5f625 skip check for local branches in managed repository
• d6f734d resolves #1111 support linked worktree attached to bare repo
• 84d2cae refactor findWorktrees function to be simpler and more efficient
• 846955c merge !1079
• Additional commits viewable in compare view

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