Bump @antora/cli from 3.2.0-alpha.11 to 3.2.0-alpha.12 in /antora

---
updated-dependencies:
- dependency-name: "@antora/cli"
  dependency-version: 3.2.0-alpha.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

See gh-50464

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

Author: dependabot[bot]

antora/package-lock.json

@@ -3,7 +3,7 @@
     "antora": "node npm/antora.js"
   },
   "dependencies": {
-    "@antora/cli": "3.2.0-alpha.11",
+    "@antora/cli": "3.2.0-alpha.12",
     "@antora/site-generator": "3.2.0-alpha.11",
     "@antora/atlas-extension": "1.0.0-alpha.5",
     "@springio/antora-extensions": "1.14.11",