Bump bindgen from 0.68.1 to 0.69.4

Bumps [bindgen](https://github.com/rust-lang/rust-bindgen) from 0.68.1 to 0.69.4.
- [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@v0.68.1...v0.69.4)

---
updated-dependencies:
- dependency-name: bindgen
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]