Merge pull request #368 from spring-cloud/dependabot/npm_and_yarn/docs/4.1.x/antora/collector-extension-1.0.0-beta.4

Bump @antora/collector-extension from 1.0.0-beta.3 to 1.0.0-beta.4 in /docs

Author: ryanjbaxter

docs/package.json

@@ -2,7 +2,7 @@
   "dependencies": {
     "antora": "3.2.0-alpha.6",
     "@antora/atlas-extension": "1.0.0-alpha.2",
-    "@antora/collector-extension": "1.0.0-beta.3",
+    "@antora/collector-extension": "1.0.0-beta.4",
     "@asciidoctor/tabs": "1.0.0-beta.6",
     "@springio/antora-extensions": "1.14.2",
     "@springio/asciidoctor-extensions": "1.0.0-alpha.14"