build(deps): update bindgen requirement from 0.69 to 0.70

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@v0.69.0...v0.70.0)

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

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

neqo-crypto/Cargo.toml

@@ -22,7 +22,7 @@ neqo-common = { path = "../neqo-common" }
 
 [build-dependencies]
 # Sync with https://searchfox.org/mozilla-central/source/Cargo.lock 2024-02-08
-bindgen = { version = "0.69", default-features = false, features = ["runtime"] }
+bindgen = { version = "0.70", default-features = false, features = ["runtime"] }
 mozbuild = { version = "0.1", default-features = false, optional = true }
 semver = { version = "1.0", default-features = false }
 serde = { version = "1.0", default-features = false }