chore(deps): bump num-bigint from 0.4.3 to 0.4.6

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.4.3 to 0.4.6.
- [Changelog](https://github.com/rust-num/num-bigint/blob/master/RELEASES.md)
- [Commits](rust-num/num-bigint@num-bigint-0.4.3...num-bigint-0.4.6)

---
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

@@ -35,7 +35,7 @@ argh = "^0.1.4"
 pipe-trait = "^0.4.0"
 smart-default = "^0.7.1"
 serde_yaml = "^0.9.14"
-num-bigint = "^0.4.0"
+num-bigint = "^0.4.6"
 num-traits = "^0.2.14"
 alpm = "^3.0.5"
 git2 = "^0.18.3"