Bump num-bigint from 0.2.6 to 0.4.3

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.2.6 to 0.4.3.
- [Release notes](https://github.com/rust-num/num-bigint/releases)
- [Changelog](https://github.com/rust-num/num-bigint/blob/master/RELEASES.md)
- [Commits](rust-num/num-bigint@num-bigint-0.2.6...num-bigint-0.4.3)

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

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

client/consensus/babe/Cargo.toml

@@ -22,7 +22,7 @@ sc-consensus = { version = "0.10.0-dev", path = "../../../client/consensus/commo
 sp-core = { version = "6.0.0", path = "../../../primitives/core" }
 sp-application-crypto = { version = "6.0.0", path = "../../../primitives/application-crypto" }
 sp-keystore = { version = "0.12.0", path = "../../../primitives/keystore" }
-num-bigint = "0.2.3"
+num-bigint = "0.4.3"
 num-rational = "0.2.2"
 num-traits = "0.2.8"
 serde = { version = "1.0.136", features = ["derive"] }

primitives/arithmetic/fuzzer/Cargo.toml

@@ -17,7 +17,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 sp-arithmetic = { version = "5.0.0", path = ".." }
 honggfuzz = "0.5.49"
 primitive-types = "0.11.1"
-num-bigint = "0.2"
+num-bigint = "0.4"
 
 [[bin]]
 name = "biguint"