Bump @antora/collector-extension in /docs

---
updated-dependencies:
- dependency-name: "@antora/collector-extension"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -2,7 +2,7 @@
 	"dependencies": {
 		"antora": "3.2.0-alpha.4",
 		"@antora/atlas-extension": "1.0.0-alpha.2",
-		"@antora/collector-extension": "1.0.0-alpha.3",
+		"@antora/collector-extension": "1.0.0-beta.2",
 		"@asciidoctor/tabs": "1.0.0-beta.6",
 		"@springio/antora-extensions": "1.11.1",
 		"@springio/asciidoctor-extensions": "1.0.0-alpha.14"