Bump num-bigint from 0.4.4 to 0.4.5

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.4.4 to 0.4.5.
- [Changelog](https://github.com/rust-num/num-bigint/blob/master/RELEASES.md)
- [Commits](rust-num/num-bigint@num-bigint-0.4.4...num-bigint-0.4.5)

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

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

Cargo.toml

@@ -26,7 +26,7 @@ libm = "0.2.8"
 linked_list_allocator = "0.10.5"
 littlewing = { version = "0.7.0", default-features = false }
 nom = { version = "7.1.3", default-features = false, features = ["alloc"] }
-num-bigint = { version = "0.4.4", default-features = false }
+num-bigint = { version = "0.4.5", default-features = false }
 num-traits = { version = "0.2.18", default-features = false }
 object = { version = "0.35.0", default-features = false, features = ["read"] }
 pbkdf2 = { version = "0.12.2", default-features = false, features = ["hmac"] }