chore: updating docfx doclet version (#227)
chore: updating docfx doclet version (#227)

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- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/java-shared-config/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> ☕️

googleapis/java-shared-config,googleapis/java-shared-config