Update bindgen requirement from 0.66.1 to 0.68.1

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@v0.66.1...v0.68.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

recisdb-rs/Cargo.toml

@@ -37,7 +37,7 @@ nix = { version = "^0.27.1", features = ["ioctl"] }
 pin-project-lite = "0.2.9"
 
 [build-dependencies]
-bindgen = { version = "0.66.1", default_features = false }
+bindgen = { version = "0.68.1", default_features = false }
 cargo-deb = "1.38.1"
 cc = "1.0.70"
 glob = "0.3"