Bump cmov from 0.5.3 to 0.5.4 (#304)

Bumps [cmov](https://github.com/RustCrypto/utils) from 0.5.3 to 0.5.4.
- [Commits](RustCrypto/utils@cmov-v0.5.3...cmov-v0.5.4)

---
updated-dependencies:
- dependency-name: cmov
  dependency-version: 0.5.4
  dependency-type: indirect
...

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