chore(deps): Bump exchange-rs from 42f1466 to 6fe640e

Bumps [exchange-rs](https://github.com/neeml/exchange-rs) from `42f1466` to `6fe640e`.
- [Commits](neeml/exchange-rs@42f1466...6fe640e)

---
updated-dependencies:
- dependency-name: exchange-rs
  dependency-version: 6fe640e4969cb78115678b6113710084b193065d
  dependency-type: direct:production
...

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Author: dependabot[bot]