build(deps): bump crypto-bigint from 0.5.3 to 0.5.5 (#1001)

Bumps [crypto-bigint](https://github.com/RustCrypto/crypto-bigint) from 0.5.3 to 0.5.5.
- [Changelog](https://github.com/RustCrypto/crypto-bigint/blob/master/CHANGELOG.md)
- [Commits](RustCrypto/crypto-bigint@v0.5.3...v0.5.5)

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

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

bign256/Cargo.toml

@@ -23,7 +23,7 @@ elliptic-curve = { version = "0.13.8", features = ["hazmat", "sec1"] }
 primeorder = { version = "0.13.5", optional = true, path = "../primeorder" }
 signature = { version = "2", optional = true }
 belt-hash = { version = "0.1.0", optional = true, default-features = false }
-crypto-bigint = { version = "0.5.3", optional = true }
+crypto-bigint = { version = "0.5.5", optional = true }
 rfc6979 = { version = "0.4", optional = true }
 
 [dev-dependencies]