Update bindgen requirement from 0.70 to 0.71 in /zstd-safe/zstd-sys (#312)

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@v0.70.0...v0.71.0)

---
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>

Author: dependabot[bot]

zstd-safe/zstd-sys/Cargo.toml

@@ -51,7 +51,7 @@ doctest = false  # Documentation is for C code, good luck testing that.
 
 [build-dependencies.bindgen]
 optional = true
-version = "0.70"
+version = "0.71"
 default-features = false
 features = ["runtime", "which-rustfmt"]