build(deps): bump num-bigint from 0.4.8 to 0.5.1

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.4.8 to 0.5.1.
- [Changelog](https://github.com/rust-num/num-bigint/blob/main/RELEASES.md)
- [Commits](rust-num/num-bigint@num-bigint-0.4.8...num-bigint-0.5.1)

---
updated-dependencies:
- dependency-name: num-bigint
  dependency-version: 0.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -26,7 +26,7 @@ getrandom = { version = "0.4", optional = true, features = ["sys_rng"] }
 [dev-dependencies]
 bencher = "0.1"
 hex = "0.4"
-num-bigint = "0.4"
+num-bigint = "0.5"
 
 [features]
 default = []