Bump @antora/collector-extension from 1.0.0-beta.6 to 1.0.0-rc.1

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

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

package.json

@@ -4,7 +4,7 @@
         "generate": "npx antora antora-playbook.yml"
     },
     "devDependencies": {
-        "@antora/collector-extension": "^1.0.0-beta.6",
+        "@antora/collector-extension": "^1.0.0-rc.1",
         "@antora/lunr-extension": "^1.0.0-alpha.8",
         "antora": "^3.1.9"
     }