build(deps): bump tower-test from 74881d5 to 664cb35 (#4403)

Bumps [tower-test](https://github.com/tower-rs/tower) from `74881d5` to `664cb35`.
- [Release notes](https://github.com/tower-rs/tower/releases)
- [Commits](tower-rs/tower@74881d5...664cb35)

---
updated-dependencies:
- dependency-name: tower-test
  dependency-type: direct:production
...

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Author: dependabot[bot]