Update bitfield requirement from 0.15.0 to 0.16.1 (#4419)

Updates the requirements on [bitfield](https://github.com/dzamlo/rust-bitfield) to permit the latest version.
- [Changelog](https://github.com/dzamlo/rust-bitfield/blob/v0.16.1/CHANGELOG.md)
- [Commits](dzamlo/rust-bitfield@v0.15.0...v0.16.1)

---
updated-dependencies:
- dependency-name: bitfield
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -48,7 +48,7 @@ include = [
 cmake = "0.1"
 
 [dependencies]
-bitfield = "0.15.0"
+bitfield = "0.16.1"
 libc = "0.2.0"
 c-types = "3.0.0"
 serde = { version = "1.0.117", features = ["derive"] }