Bump @springio/antora-extensions from 1.14.6 to 1.14.7 in /docs

---
updated-dependencies:
- dependency-name: "@springio/antora-extensions"
  dependency-version: 1.14.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -4,7 +4,7 @@
     "@antora/atlas-extension": "1.0.0-alpha.2",
     "@antora/collector-extension": "1.0.1",
     "@asciidoctor/tabs": "1.0.0-beta.6",
-    "@springio/antora-extensions": "1.14.6",
+    "@springio/antora-extensions": "1.14.7",
     "@springio/asciidoctor-extensions": "1.0.0-alpha.17"
   }
 }