Bump @springio/asciidoctor-extensions

Bumps [@springio/asciidoctor-extensions](https://github.com/spring-io/asciidoctor-extensions) from 1.0.0-alpha.8 to 1.0.0-alpha.10.
- [Changelog](https://github.com/spring-io/asciidoctor-extensions/blob/main/CHANGELOG.adoc)
- [Commits](https://github.com/spring-io/asciidoctor-extensions/compare/v1.0.0-alpha.8...v1.0.0-alpha.10)

---
updated-dependencies:
- dependency-name: "@springio/asciidoctor-extensions"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -5,6 +5,6 @@
     "@antora/collector-extension": "1.0.0-alpha.3",
     "@asciidoctor/tabs": "1.0.0-beta.3",
     "@springio/antora-extensions": "1.7.0",
-    "@springio/asciidoctor-extensions": "1.0.0-alpha.8"
+    "@springio/asciidoctor-extensions": "1.0.0-alpha.10"
   }
 }