Update bindgen requirement from 0.63.0 to 0.64.0 (#91)

Updates the requirements on [bindgen](https://github.com/rust-lang/rust-bindgen) to permit the latest version.
- [Release notes](https://github.com/rust-lang/rust-bindgen/releases)
- [Changelog](https://github.com/rust-lang/rust-bindgen/blob/main/CHANGELOG.md)
- [Commits](rust-lang/rust-bindgen@v0.63.0...v0.64.0)

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

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

Cargo.toml

@@ -31,4 +31,4 @@ name = "dmesg"
 path = "src/dmesg.rs"
 
 [build-dependencies]
-bindgen = { version = "0.63.0", default-features = false, features = ["runtime"] }
+bindgen = { version = "0.64.0", default-features = false, features = ["runtime"] }