Erdős Problem 193: status mismatch (repo=open, erdosproblems.com=solved)

The status of [Erdős problem 193](https://www.erdosproblems.com/193) appears to have changed.

- **[This repo](http://github.com/google-deepmind/formal-conjectures/blob/main/FormalConjectures/ErdosProblems/193.lean)**: `open` (in `FormalConjectures/ErdosProblems/193.lean`)
- **[erdosproblems.com/193](https://www.erdosproblems.com/193)**: `solved`

Please verify and update the `@[category research ...]` annotation if appropriate.

Inspect FormalConjectures/ErdosProblems/193.lean and compare its status annotation with the linked Erdős Problems page. Verify whether problem 193 is solved, then update the @[category research ...] annotation if needed; done means the repository status matches the verified external status.

Written by the indexing model from the issue text.