Upgrade to @springio/antora-extensions 1.11.1

Author: philwebb

antora/package-lock.json

@@ -6,7 +6,7 @@
     "@antora/cli": "3.2.0-alpha.4",
     "@antora/site-generator": "3.2.0-alpha.4",
     "@antora/atlas-extension": "1.0.0-alpha.2",
-    "@springio/antora-extensions": "1.11.0",
+    "@springio/antora-extensions": "1.11.1",
     "@springio/antora-xref-extension": "1.0.0-alpha.3",
     "@springio/antora-zip-contents-collector-extension": "1.0.0-alpha.8",
     "@asciidoctor/tabs": "1.0.0-beta.6",