Update bindgen requirement from 0.37.0 to 0.63.0

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/master/CHANGELOG.md)
- [Commits](rust-lang/rust-bindgen@v0.37.0...v0.51.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -6,7 +6,7 @@ version = "0.1.0"
 build = "build.rs"
 
 [build-dependencies]
-bindgen = "0.37.0"
+bindgen = "0.51.1"
 glob = "0.2.11"
 syntex = "0.42" # keep syntex version in match with pnet_macros/Cargo.toml
 pnet = "0.25.0"