Bump convict from 6.2.4 to 6.2.5 in /antora

Bumps [convict](https://github.com/mozilla/node-convict) from 6.2.4 to 6.2.5.
- [Changelog](https://github.com/mozilla/node-convict/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mozilla/node-convict/commits)

---
updated-dependencies:
- dependency-name: convict
  dependency-version: 6.2.5
  dependency-type: indirect
...

See gh-49809

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Author: dependabot[bot]