Update num requirement from ~0.3 to ~0.4

Updates the requirements on [num](https://github.com/rust-num/num) to permit the latest version.
- [Release notes](https://github.com/rust-num/num/releases)
- [Changelog](https://github.com/rust-num/num/blob/master/RELEASES.md)
- [Commits](https://github.com/rust-num/num/compare/num-0.3.0...num-0.4.0)

---
updated-dependencies:
- dependency-name: num
  dependency-type: direct:production
...

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

edn/Cargo.toml

@@ -12,7 +12,7 @@ readme = "./README.md"
 [dependencies]
 chrono = "~0.4"
 itertools = "~0.9"
-num = "~0.3"
+num = "~0.4"
 ordered-float = "~2.5"
 pretty = "~0.10"
 uuid = { version = "~0.8", features = ["v4", "serde"] }