Bump @antora/cli from 3.1.8 to 3.1.9

Bumps [@antora/cli](https://gitlab.com/antora/antora) from 3.1.8 to 3.1.9.
- [Changelog](https://gitlab.com/antora/antora/blob/main/CHANGELOG.adoc)
- [Commits](https://gitlab.com/antora/antora/compare/v3.1.8...v3.1.9)

---
updated-dependencies:
- dependency-name: "@antora/cli"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -14,7 +14,7 @@
     "url": "https://github.com/sorairolake/abcrypt/issues"
   },
   "devDependencies": {
-    "@antora/cli": "^3.1.8",
+    "@antora/cli": "^3.1.9",
     "@antora/lunr-extension": "^1.0.0-alpha.8",
     "@antora/site-generator": "^3.1.8",
     "@djencks/asciidoctor-mathjax": "^0.0.9"