Bump ruzstd from 0.3.0 to 0.3.1 (#314)

Bumps [ruzstd](https://github.com/KillingSpark/zstd-rs) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/KillingSpark/zstd-rs/releases)
- [Commits](KillingSpark/zstd-rs@v0.3.0...v0.3.1)

---
updated-dependencies:
- dependency-name: ruzstd
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

lib/Cargo.toml

@@ -62,7 +62,7 @@ num-traits = { version = "0.2.15", default-features = false }
 pbkdf2 = { version = "0.12.1", default-features = false }
 rand = { version = "0.8.5", default-features = false, features = ["std", "std_rng"] }  # TODO: rand is used in hack-y ways at the moment ; these features should be removed
 rand_chacha = { version = "0.3.1", default-features = false }
-ruzstd = { version = "0.3.0" }  # TODO: doesn't support no_std :-/
+ruzstd = { version = "0.3.1" }  # TODO: doesn't support no_std :-/
 schnorrkel = { version = "0.10.2", default-features = false, features = ["preaudit_deprecated", "u64_backend"] }
 serde = { version = "1.0.156", default-features = false, features = ["alloc", "derive"] }
 serde_json = { version = "1.0.94", default-features = false, features = ["alloc", "raw_value"] }